diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/ProjectSupervisorView.tsx b/apps/ai-game-creator-shell/src/features/project-workspace/ProjectSupervisorView.tsx
index 0d7c44c42..af2336e9a 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/ProjectSupervisorView.tsx
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/ProjectSupervisorView.tsx
@@ -70,6 +70,16 @@ function directCodexTurnMessageId(turnId: string, role: 'user' | 'assistant') {
   return `direct-codex:${turnId}:${role}`;
 }
 
+/** 从 `direct-codex:<turnId>:assistant` 反解回合 id；不是这个形状返回 `null`。 */
+function directCodexTurnIdFromAssistantMessageId(messageId: string) {
+  const prefix = 'direct-codex:';
+  const suffix = ':assistant';
+  if (!messageId.startsWith(prefix) || !messageId.endsWith(suffix)) {
+    return null;
+  }
+  return messageId.slice(prefix.length, -suffix.length);
+}
+
 type RuntimePanelProps = ComponentProps<typeof ProjectSupervisorRuntimePanel>;
 
 function directStatusTitle(status: string | null | undefined) {
@@ -233,6 +243,7 @@ export function ProjectSupervisorView({
   const streamTurnId = activeTurnId?.trim() ?? '';
   const toolCallsByAnchor = new Map<string, GameCreatorDirectToolCall[]>();
   const liveToolCalls: GameCreatorDirectToolCall[] = [];
+  let liveToolCallTurnId = '';
   if (directCodex) {
     for (const call of toolCalls) {
       const expected = directCodexTurnMessageId(call.turnId, 'assistant');
@@ -249,10 +260,24 @@ export function ProjectSupervisorView({
         continue;
       }
       if (streamTurnId && call.turnId === streamTurnId) {
+        if (!liveToolCallTurnId) {
+          liveToolCallTurnId = call.turnId;
+        }
         liveToolCalls.push(call);
       }
     }
   }
+  // 该回合用户消息的 `updatedAt`：拿得到就在块头显示「发送 → 结束」，拿不到只显示结束时间。
+  const userMessageUpdatedAtForTurn = (turnId: string) => {
+    if (!turnId) {
+      return 0;
+    }
+    const userId = directCodexTurnMessageId(turnId, 'user');
+    return (
+      visibleMessages.find((message) => message.messageId === userId)
+        ?.updatedAt ?? 0
+    );
+  };
   const emptyState =
     directCodex &&
     visibleMessages.length === 0 &&
@@ -363,11 +388,17 @@ export function ProjectSupervisorView({
             const anchoredToolCalls = message.messageId
               ? (toolCallsByAnchor.get(message.messageId) ?? [])
               : [];
+            const anchoredTurnId = message.messageId
+              ? directCodexTurnIdFromAssistantMessageId(message.messageId)
+              : null;
             return (
               <Fragment key={message.messageId ?? `${message.role}-${index}`}>
                 {anchoredToolCalls.length > 0 ? (
                   <ToolCallGroup
                     calls={anchoredToolCalls}
+                    userSentAt={userMessageUpdatedAtForTurn(
+                      anchoredTurnId ?? '',
+                    )}
                     className="message-tool-call"
                   />
                 ) : null}
@@ -383,6 +414,7 @@ export function ProjectSupervisorView({
           {liveToolCalls.length > 0 ? (
             <ToolCallGroup
               calls={liveToolCalls}
+              userSentAt={userMessageUpdatedAtForTurn(liveToolCallTurnId)}
               className="message-tool-call"
             />
           ) : null}
diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/ToolCallGroup.tsx b/apps/ai-game-creator-shell/src/features/project-workspace/ToolCallGroup.tsx
index 781c12f94..62fbf8f27 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/ToolCallGroup.tsx
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/ToolCallGroup.tsx
@@ -10,26 +10,36 @@ import { useId, useState } from 'react';
 
 import type { GameCreatorDirectToolCall } from '../../app/types';
 import {
+  formatClockTime,
+  formatToolCallDuration,
+  formatTurnDuration,
+  toolCallDurationMs,
   toolCallGroupSummary,
   toolCallRowText,
+  turnToolCallDurationMs,
+  turnToolCallEndedAt,
+  turnToolCallTimeLabel,
 } from './toolCallGroupPresentation';
 
 /**
  * 一回合的工具调用折叠块（Codex 风格）：
- * 块头一行汇总，展开态每行一条工具（行可二级展开看命令 / 文件明细 / 输出）。
+ * 块头一行汇总 + 该回合总用时 + 结束时间，展开态每行一条工具（行可二级展开看命令 / 文件明细 / 输出）。
  * 契约见 `docs/technical/【技术方案】GameAgent对话工具调用卡片-2026-09-14.md`。
  *
  * 无障碍：块头与每一行都是 `<button aria-expanded>` + `hidden` 控制正文，
  * 所以 Tab 可达、Enter/Space 可切换、读屏能读到展开状态与 `aria-label`。
- * 文案规则（纯函数）在 `toolCallGroupPresentation.ts`。
+ * 文案与耗时规则（纯函数）在 `toolCallGroupPresentation.ts`。
  */
 
 /** 一回合的工具调用折叠块；空集合不渲染。 */
 export function ToolCallGroup({
   calls,
+  userSentAt = 0,
   className,
 }: {
   calls: GameCreatorDirectToolCall[];
+  /** 同一回合用户消息的 `updatedAt`；拿不到就传 0，只显示结束时间。 */
+  userSentAt?: number | null;
   className?: string;
 }) {
   const [expanded, setExpanded] = useState(false);
@@ -41,6 +51,10 @@ export function ToolCallGroup({
     (left, right) => left.startedAt - right.startedAt,
   );
   const summary = toolCallGroupSummary(orderedCalls);
+  const totalDurationMs = turnToolCallDurationMs(orderedCalls);
+  const durationText = formatTurnDuration(totalDurationMs);
+  const timeLabel = turnToolCallTimeLabel(orderedCalls, userSentAt);
+  const headLabel = durationText ? `${summary}，用时 ${durationText}` : summary;
   const status = orderedCalls.some((call) => call.status === 'running')
     ? 'running'
     : orderedCalls.some((call) => call.status === 'failed')
@@ -55,6 +69,7 @@ export function ToolCallGroup({
       }
       data-testid="agent-tool-call-group"
       data-status={status}
+      data-duration-ms={totalDurationMs ?? ''}
     >
       <button
         type="button"
@@ -62,14 +77,22 @@ export function ToolCallGroup({
         data-testid="agent-tool-call-group-head"
         aria-expanded={expanded}
         aria-controls={bodyId}
-        aria-label={summary}
-        title={summary}
+        aria-label={headLabel}
+        title={headLabel}
         onClick={() => setExpanded((current) => !current)}
       >
         <span className="agent-tool-call-group-icon" aria-hidden="true">
           <ToolCallKindIcon kind={orderedCalls[0]?.kind ?? 'other'} />
         </span>
         <span className="agent-tool-call-group-summary">{summary}</span>
+        {timeLabel ? (
+          <span className="agent-tool-call-group-time">{timeLabel}</span>
+        ) : null}
+        {durationText ? (
+          <span className="agent-tool-call-group-duration">
+            {`用时 ${durationText}`}
+          </span>
+        ) : null}
         <ChevronDown
           className="agent-tool-call-group-chevron"
           size={14}
@@ -86,6 +109,14 @@ export function ToolCallGroup({
             <ToolCallRow key={call.id} call={call} />
           ))}
         </ul>
+        {timeLabel ? (
+          <p
+            className="agent-tool-call-group-foot"
+            data-testid="agent-tool-call-group-end-time"
+          >
+            {`结束于 ${formatClockTime(turnToolCallEndedAt(orderedCalls))}`}
+          </p>
+        ) : null}
       </div>
     </section>
   );
@@ -96,13 +127,21 @@ function ToolCallRow({ call }: { call: GameCreatorDirectToolCall }) {
   const [expanded, setExpanded] = useState(false);
   const detailId = useId();
   const text = toolCallRowText(call);
+  const durationMs = toolCallDurationMs(call);
+  const durationText = formatToolCallDuration(durationMs);
   const statusText =
     call.status === 'running'
       ? '执行中'
       : call.status === 'failed'
         ? '失败'
         : '';
-  const rowLabel = [text, statusText].filter(Boolean).join('，');
+  const rowLabel = [
+    text,
+    statusText,
+    durationText ? `耗时 ${durationText}` : '',
+  ]
+    .filter(Boolean)
+    .join('，');
   const changes = call.detail.changes ?? [];
   const detailCommand = call.detail.command?.trim() ?? '';
   const detailOutput = call.detail.output?.trim() ?? '';
@@ -114,6 +153,7 @@ function ToolCallRow({ call }: { call: GameCreatorDirectToolCall }) {
       data-testid="agent-tool-call-row"
       data-kind={call.kind}
       data-status={call.status}
+      data-duration-ms={durationMs ?? ''}
     >
       <button
         type="button"
@@ -131,6 +171,9 @@ function ToolCallRow({ call }: { call: GameCreatorDirectToolCall }) {
         {statusText ? (
           <span className="agent-tool-call-row-status">{statusText}</span>
         ) : null}
+        {durationText ? (
+          <span className="agent-tool-call-row-duration">{durationText}</span>
+        ) : null}
         {hasDetail ? (
           <ChevronDown
             className="agent-tool-call-row-chevron"
diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/toolCallGroupPresentation.ts b/apps/ai-game-creator-shell/src/features/project-workspace/toolCallGroupPresentation.ts
index 71ef915e7..9c928252a 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/toolCallGroupPresentation.ts
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/toolCallGroupPresentation.ts
@@ -92,3 +92,126 @@ function toolCallRowSummary(call: GameCreatorDirectToolCall) {
   }
   return call.title.trim();
 }
+
+/**
+ * 单条工具的耗时（毫秒）。
+ * `startedAt` 为 0（缺失）或 `updatedAt < startedAt`（时间倒序）时返回 `null`：
+ * 这两种情况不显示耗时，不显示 `0s` / 负数。
+ */
+export function toolCallDurationMs(
+  call: Pick<GameCreatorDirectToolCall, 'startedAt' | 'updatedAt'>,
+): number | null {
+  const startedAt = Number.isFinite(call.startedAt) ? call.startedAt : 0;
+  const updatedAt = Number.isFinite(call.updatedAt) ? call.updatedAt : 0;
+  if (startedAt <= 0 || updatedAt < startedAt) {
+    return null;
+  }
+  return updatedAt - startedAt;
+}
+
+/**
+ * 单条工具的耗时文案：`0.4s`（<1s）/ `12.3s`（<60s，整秒省略小数）/ `2m 5s`（≥60s）。
+ * 无法计算的耗时（`null` / 0 / 负数）返回 `null`。
+ */
+export function formatToolCallDuration(ms: number | null | undefined) {
+  if (ms === null || ms === undefined || !Number.isFinite(ms) || ms <= 0) {
+    return null;
+  }
+  if (ms < 60000) {
+    const tenths = Math.max(1, Math.round(ms / 100));
+    if (tenths < 600) {
+      const value = tenths / 10;
+      return Number.isInteger(value) ? `${value}s` : `${value.toFixed(1)}s`;
+    }
+  }
+  const totalSeconds = Math.max(60, Math.round(ms / 1000));
+  const minutes = Math.floor(totalSeconds / 60);
+  const restSeconds = totalSeconds % 60;
+  return restSeconds === 0 ? `${minutes}m` : `${minutes}m ${restSeconds}s`;
+}
+
+/** 一回合总用时：该回合所有工具的 `min(startedAt)` → `max(updatedAt)`；取不到返回 `null`。 */
+export function turnToolCallDurationMs(
+  calls: Array<Pick<GameCreatorDirectToolCall, 'startedAt' | 'updatedAt'>>,
+): number | null {
+  let minStartedAt = Number.POSITIVE_INFINITY;
+  let maxUpdatedAt = Number.NEGATIVE_INFINITY;
+  for (const call of calls) {
+    const startedAt = Number.isFinite(call.startedAt) ? call.startedAt : 0;
+    const updatedAt = Number.isFinite(call.updatedAt) ? call.updatedAt : 0;
+    if (startedAt > 0) {
+      minStartedAt = Math.min(minStartedAt, startedAt);
+    }
+    if (updatedAt > 0) {
+      maxUpdatedAt = Math.max(maxUpdatedAt, updatedAt);
+    }
+  }
+  if (!Number.isFinite(minStartedAt) || !Number.isFinite(maxUpdatedAt)) {
+    return null;
+  }
+  if (maxUpdatedAt < minStartedAt) {
+    return null;
+  }
+  return maxUpdatedAt - minStartedAt;
+}
+
+/** 块头总用时文案：`42秒` / `4分钟` / `5分钟 45秒`；无法计算的耗时返回 `null`。 */
+export function formatTurnDuration(ms: number | null | undefined) {
+  if (ms === null || ms === undefined || !Number.isFinite(ms) || ms <= 0) {
+    return null;
+  }
+  const seconds = Math.max(1, Math.round(ms / 1000));
+  if (seconds < 60) {
+    return `${seconds}秒`;
+  }
+  const minutes = Math.floor(seconds / 60);
+  const restSeconds = seconds % 60;
+  return restSeconds === 0
+    ? `${minutes}分钟`
+    : `${minutes}分钟 ${restSeconds}秒`;
+}
+
+/** 该回合的结束时间：`max(updatedAt)`；取不到返回 0。 */
+export function turnToolCallEndedAt(
+  calls: Array<Pick<GameCreatorDirectToolCall, 'updatedAt'>>,
+) {
+  let maxUpdatedAt = 0;
+  for (const call of calls) {
+    if (Number.isFinite(call.updatedAt) && call.updatedAt > maxUpdatedAt) {
+      maxUpdatedAt = call.updatedAt;
+    }
+  }
+  return maxUpdatedAt;
+}
+
+/** 本地 `HH:mm`；时间戳缺失（0 / 非法）返回 `null`，不编造时间。 */
+export function formatClockTime(timestamp: number | null | undefined) {
+  if (
+    timestamp === null ||
+    timestamp === undefined ||
+    !Number.isFinite(timestamp) ||
+    timestamp <= 0
+  ) {
+    return null;
+  }
+  const date = new Date(timestamp);
+  const hours = String(date.getHours()).padStart(2, '0');
+  const minutes = String(date.getMinutes()).padStart(2, '0');
+  return `${hours}:${minutes}`;
+}
+
+/**
+ * 块头时间文案：该回合结束时间（`max(updatedAt)` 的本地 `HH:mm`）；
+ * 能拿到同回合用户消息时间（`updatedAt > 0`）时显示「发送 → 结束」，取不到就只显示结束时间。
+ */
+export function turnToolCallTimeLabel(
+  calls: Array<Pick<GameCreatorDirectToolCall, 'updatedAt'>>,
+  userSentAt: number | null | undefined,
+) {
+  const endLabel = formatClockTime(turnToolCallEndedAt(calls));
+  if (!endLabel) {
+    return null;
+  }
+  const sentLabel = formatClockTime(userSentAt ?? 0);
+  return sentLabel ? `${sentLabel} → ${endLabel}` : endLabel;
+}
diff --git a/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts b/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts
index da2b77396..abbcb8cbf 100644
--- a/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts
+++ b/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts
@@ -8260,6 +8260,13 @@ export function registerProjectSupervisorSurfaceTests() {
     expect(group.getAttribute('data-status')).toBe('failed');
     const groupHead = within(group).getByTestId('agent-tool-call-group-head');
     expect(groupHead.textContent).toContain('已执行 1 个命令、1 个文件变更');
+    // 块头右侧是总用时（min(startedAt) → max(updatedAt)），并在 data-* 上暴露原始毫秒。
+    expect(group.getAttribute('data-duration-ms')).toBe('100');
+    expect(groupHead.textContent).toContain('用时 1秒');
+    // 同一回合的用户消息时间（App 提交时写入）→ 显示「发送 → 结束」。
+    expect(
+      groupHead.querySelector('.agent-tool-call-group-time')?.textContent,
+    ).toMatch(/^\d{2}:\d{2} → \d{2}:\d{2}$/);
     // 实时回合的块落在消息流末尾：该回合 assistant 消息还没落盘，
     // 所以它在上一条 assistant 消息之后，而不是被锚到别人头上。
     const liveChildren = Array.from((messageList as HTMLElement).children);
@@ -8296,6 +8303,11 @@ export function registerProjectSupervisorSurfaceTests() {
     expect(within(commandRow).getByText('已运行 npm run build')).not.toBeNull();
     expect(within(fileRow).getByText('已编辑 game/src/hero.ts')).not.toBeNull();
     expect(within(fileRow).getByText('失败')).not.toBeNull();
+    // 每行右侧显示该工具自己的耗时（`startedAt` → `updatedAt`）。
+    expect(commandRow.getAttribute('data-duration-ms')).toBe('100');
+    expect(within(commandRow).getByText('0.1s')).not.toBeNull();
+    expect(fileRow.getAttribute('data-duration-ms')).toBe('50');
+    expect(within(fileRow).getByText('0.1s')).not.toBeNull();
 
     // 行可二级展开：默认折叠，展开后看到命令 / 路径 + 变更类型 / 输出。
     const commandRowHead = within(commandRow).getByRole('button');
@@ -8514,6 +8526,12 @@ export function registerProjectSupervisorSurfaceTests() {
     expect(persistedHead.textContent).toContain(
       '已执行 1 个命令、1 个文件变更',
     );
+    // 回读回来的时间戳一样能算总用时与「发送 → 结束」。
+    expect(persistedGroup.getAttribute('data-duration-ms')).toBe('1000');
+    expect(persistedHead.textContent).toContain('用时 1秒');
+    expect(
+      persistedHead.querySelector('.agent-tool-call-group-time')?.textContent,
+    ).toMatch(/^\d{2}:\d{2} → \d{2}:\d{2}$/);
     const messageList = supervisorSurface.querySelector(
       '.project-supervisor-message-list',
     ) as HTMLElement;
@@ -8525,9 +8543,15 @@ export function registerProjectSupervisorSurfaceTests() {
     expect(assistantIndex).toBeGreaterThanOrEqual(0);
     expect(groupIndex).toBe(assistantIndex - 1);
     fireEvent.click(persistedHead);
+    const persistedRows = within(persistedGroup).getAllByTestId(
+      'agent-tool-call-row',
+    );
+    expect(persistedRows).toHaveLength(2);
+    // 每行右侧是该工具自己的耗时（0.5s / 0.5s）。
+    expect(persistedRows[0]?.getAttribute('data-duration-ms')).toBe('500');
     expect(
-      within(persistedGroup).getAllByTestId('agent-tool-call-row'),
-    ).toHaveLength(2);
+      within(persistedRows[0] as HTMLElement).getByText('0.5s'),
+    ).not.toBeNull();
   });
 
   it('renders the Codex empty state and opens the panel settings overlay in a fresh direct chat', async () => {
diff --git a/apps/ai-game-creator-shell/tests/appSurface/tool-call-group.suite.ts b/apps/ai-game-creator-shell/tests/appSurface/tool-call-group.suite.ts
index 152d5d8da..cfcd782aa 100644
--- a/apps/ai-game-creator-shell/tests/appSurface/tool-call-group.suite.ts
+++ b/apps/ai-game-creator-shell/tests/appSurface/tool-call-group.suite.ts
@@ -1,8 +1,13 @@
 import type { GameCreatorDirectToolCall } from '../../src/app/types';
 import { ToolCallGroup } from '../../src/features/project-workspace/ToolCallGroup';
 import {
+  formatToolCallDuration,
+  formatTurnDuration,
+  toolCallDurationMs,
   toolCallGroupSummary,
   toolCallRowText,
+  turnToolCallDurationMs,
+  turnToolCallTimeLabel,
 } from '../../src/features/project-workspace/toolCallGroupPresentation';
 import { expect, fireEvent, it, React, render, within } from './harness';
 
@@ -205,4 +210,148 @@ export function registerToolCallGroupTests() {
     const empty = render(React.createElement(ToolCallGroup, { calls: [] }));
     expect(empty.container.firstChild).toBeNull();
   });
+
+  it('formats durations and turn totals across the documented boundaries', () => {
+    // 单条工具耗时：`startedAt` 缺失（0）/ 0 / 时间倒序 → 不显示耗时。
+    expect(
+      toolCallDurationMs(toolCall({ id: 'a', kind: 'command' })),
+    ).toBeNull();
+    expect(formatToolCallDuration(null)).toBeNull();
+    expect(formatToolCallDuration(0)).toBeNull();
+    expect(
+      toolCallDurationMs(
+        toolCall({
+          id: 'b',
+          kind: 'command',
+          startedAt: 2000,
+          updatedAt: 1000,
+        }),
+      ),
+    ).toBeNull();
+    // <1s 一位小数；<60s 整秒省略小数；≥60s 用 `Xm Ys`。
+    expect(formatToolCallDuration(400)).toBe('0.4s');
+    expect(formatToolCallDuration(950)).toBe('1s');
+    expect(formatToolCallDuration(12300)).toBe('12.3s');
+    expect(formatToolCallDuration(12000)).toBe('12s');
+    expect(formatToolCallDuration(125000)).toBe('2m 5s');
+    expect(formatToolCallDuration(120000)).toBe('2m');
+
+    // 一回合总用时 = min(startedAt) → max(updatedAt)；缺时间戳的工具被跳过。
+    const calls = [
+      toolCall({ id: 'a', kind: 'command', startedAt: 5000, updatedAt: 6000 }),
+      toolCall({
+        id: 'b',
+        kind: 'file_change',
+        startedAt: 1000,
+        updatedAt: 9000,
+      }),
+      toolCall({ id: 'c', kind: 'web_search' }),
+    ];
+    expect(turnToolCallDurationMs(calls)).toBe(8000);
+    expect(formatTurnDuration(8000)).toBe('8秒');
+    expect(formatTurnDuration(42000)).toBe('42秒');
+    expect(formatTurnDuration(240000)).toBe('4分钟');
+    expect(formatTurnDuration(345000)).toBe('5分钟 45秒');
+    expect(formatTurnDuration(null)).toBeNull();
+    expect(formatTurnDuration(0)).toBeNull();
+    // 全部没有时间戳时算不出总用时。
+    expect(
+      turnToolCallDurationMs([toolCall({ id: 'd', kind: 'command' })]),
+    ).toBe(null);
+
+    // 块头时间：取得到用户消息时间就是「发送 → 结束」，取不到只显示结束时间，都取不到就不显示。
+    expect(turnToolCallTimeLabel(calls, 1000)).toMatch(
+      /^\d{2}:\d{2} → \d{2}:\d{2}$/,
+    );
+    expect(turnToolCallTimeLabel(calls, 0)).toMatch(/^\d{2}:\d{2}$/);
+    expect(
+      turnToolCallTimeLabel([toolCall({ id: 'e', kind: 'command' })], 0),
+    ).toBe(null);
+  });
+
+  it('renders per-row durations plus the turn total, and nothing when timestamps are missing', () => {
+    const { container } = render(
+      React.createElement(ToolCallGroup, {
+        calls: [
+          toolCall({
+            id: 'a',
+            kind: 'command',
+            summary: 'npm run build',
+            startedAt: 1000,
+            updatedAt: 1400,
+          }),
+          toolCall({
+            id: 'b',
+            kind: 'web_search',
+            summary: '玩法调研',
+            startedAt: 1400,
+            updatedAt: 17900,
+          }),
+          toolCall({
+            id: 'c',
+            kind: 'file_change',
+            title: '编辑 1 个文件',
+            summary: 'game/src/hero.ts',
+            startedAt: 17900,
+            updatedAt: 17900,
+          }),
+        ],
+        userSentAt: 1000,
+      }),
+    );
+    const group = container.querySelector(
+      '[data-testid="agent-tool-call-group"]',
+    ) as HTMLElement;
+    // 总用时：1000 → 17900，块头显示「用时 17秒」，`data-duration-ms` 暴露原始毫秒。
+    expect(group.getAttribute('data-duration-ms')).toBe('16900');
+    const head = within(group).getByTestId('agent-tool-call-group-head');
+    expect(head.textContent).toContain('用时 17秒');
+    expect(head.getAttribute('aria-label')).toBe(
+      '已执行 1 个命令、1 个文件变更、1 个联网搜索，用时 17秒',
+    );
+    // 时间戳不写死时区：`HH:mm → HH:mm`（发送 → 结束）。
+    expect(
+      head.querySelector('.agent-tool-call-group-time')?.textContent,
+    ).toMatch(/^\d{2}:\d{2} → \d{2}:\d{2}$/);
+
+    fireEvent.click(head);
+    const rows = within(group).queryAllByTestId('agent-tool-call-row');
+    expect(rows[0]?.getAttribute('data-duration-ms')).toBe('400');
+    expect(within(rows[0] as HTMLElement).getByText('0.4s')).not.toBeNull();
+    expect(rows[1]?.getAttribute('data-duration-ms')).toBe('16500');
+    expect(within(rows[1] as HTMLElement).getByText('16.5s')).not.toBeNull();
+    // startedAt === updatedAt：耗时为 0 —— `data-duration-ms` 如实暴露 0，但行上不显示 `0s`。
+    expect(rows[2]?.getAttribute('data-duration-ms')).toBe('0');
+    expect(within(rows[2] as HTMLElement).queryByText('0s')).toBeNull();
+    // 块尾显示该回合结束时间。
+    expect(
+      within(group).getByTestId('agent-tool-call-group-end-time').textContent,
+    ).toMatch(/^结束于 \d{2}:\d{2}$/);
+
+    // 时间戳缺失（startedAt 为 0）：块头与行都不显示耗时。
+    const missing = render(
+      React.createElement(ToolCallGroup, {
+        calls: [
+          toolCall({ id: 'z', kind: 'command', summary: 'npm run build' }),
+        ],
+      }),
+    );
+    const missingGroup = missing.container.querySelector(
+      '[data-testid="agent-tool-call-group"]',
+    ) as HTMLElement;
+    expect(missingGroup.getAttribute('data-duration-ms')).toBe('');
+    expect(
+      within(missingGroup).getByTestId('agent-tool-call-group-head')
+        .textContent,
+    ).toBe('已执行 1 个命令');
+    fireEvent.click(
+      within(missingGroup).getByTestId('agent-tool-call-group-head'),
+    );
+    const missingRow = within(missingGroup).getByTestId('agent-tool-call-row');
+    expect(missingRow.getAttribute('data-duration-ms')).toBe('');
+    expect(within(missingRow).queryByText('0s')).toBeNull();
+    expect(
+      missingGroup.querySelector('.agent-tool-call-group-end-time'),
+    ).toBeNull();
+  });
 }
diff --git a/docs/technical/【技术方案】GameAgent对话工具调用卡片-2026-09-14.md b/docs/technical/【技术方案】GameAgent对话工具调用卡片-2026-09-14.md
index 10da3aea8..9d4ecb2d6 100644
--- a/docs/technical/【技术方案】GameAgent对话工具调用卡片-2026-09-14.md
+++ b/docs/technical/【技术方案】GameAgent对话工具调用卡片-2026-09-14.md
@@ -88,7 +88,9 @@ toolCalls?: DirectTurnToolCall[] | null;
 - 文案规则（按 kind，不允许自由发挥）：
   - 块头汇总按 kind 计数、顺序固定 `command → file_change → mcp_tool → web_search → context_compaction → other`，标签 `命令`/`文件变更`/`工具调用`/`联网搜索`/`上下文整理`/`其他操作`，形如 `已执行 5 个命令、2 个文件变更`；空集合不渲染块。
   - 行文案：`command` → `已运行 {summary}`、`file_change` → `已编辑 {summary}`、`mcp_tool` → `已调用 {summary}`、`web_search` → `已搜索 {summary}`、`context_compaction` → `已整理上下文`、`other` → `已执行 {summary}`；`failed` 行加 `失败` 并用现有 `--platform-*` 错误色。
-  - 耗时：单条工具 `startedAt` → `updatedAt`，块头 = 该回合所有工具的 `min(startedAt)` → `max(updatedAt)`。`startedAt` 为 0 或 `updatedAt < startedAt` 时不显示耗时（不显示 `0s` / 负数）。
+  - 耗时：单条工具 = `startedAt` → `updatedAt`，块头总用时 = 该回合所有工具的 `min(startedAt)` → `max(updatedAt)`。单条格式：`<1s` → `0.4s`、`<60s` → `12.3s`（整秒省略小数）、`≥60s` → `2m 5s`；块头格式：`42秒` / `4分钟` / `5分钟 45秒`。`startedAt` 为 0 或 `updatedAt < startedAt` 时不显示耗时（不显示 `0s` / 负数），耗时为 0 时同样不显示 `0s`。
+  - 时间：块头显示该回合结束时间（`max(updatedAt)` 的本地 `HH:mm`）；同一回合能拿到用户消息时间（`updatedAt > 0`）时显示 `HH:mm → HH:mm`（发送 → 结束），取不到就只显示结束时间，不编造。展开态块尾再写一行 `结束于 HH:mm`。
+  - 调试属性：块与行都带 `data-duration-ms`（原始毫秒，无法计算时为空串）与稳定 `data-testid`（块 `agent-tool-call-group`、行 `agent-tool-call-row`）。
 - 必须用 `<button aria-expanded>` + `hidden` 控制展开（键盘可达、可读屏），块头与行都是按钮：`aria-label` = 汇总 / 行文案 + 耗时；默认折叠。
 - 输入框、消息气泡、消息列表滚动模型**不变**；块只是消息流里的一个块。