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 9396c17df..ec2ab047a 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
@@ -76,7 +76,17 @@ export function ToolCallGroup({
   // min(startedAt) → max(updatedAt)，不掺入本地时钟。
   const totalDurationMs = running
     ? startedAt > 0
-      ? Math.max(0, Date.now() - startedAt)
+      ? (() => {
+          const latestUpdatedAt = Math.max(
+            ...orderedCalls.map((call) => call.updatedAt || 0),
+          );
+          // A running snapshot can still carry a monotonic update time. Use
+          // that delta when available; fall back to wall-clock elapsed time
+          // for live events that have no update timestamp yet.
+          return latestUpdatedAt > startedAt
+            ? latestUpdatedAt - startedAt
+            : Math.max(0, Date.now() - startedAt);
+        })()
       : null
     : turnToolCallDurationMs(orderedCalls);
   const durationText = formatTurnDuration(totalDurationMs);