Dynamic duration: 60s floor (keep 30% margin)

app.py

@@ -148,7 +148,7 @@ def _gpu_duration(final_prompt, mode, width, height, seed, do_local, progress=No
     budget = steps * _per_step(width, height) + DIFFUSION_OVERHEAD_S
     if do_local:
         budget += LOCAL_UPSAMPLE_S
-    return max(30, int(math.ceil(budget * DURATION_MARGIN)))
+    return max(60, int(math.ceil(budget * DURATION_MARGIN)))
 
 
 @spaces.GPU(duration=_gpu_duration, size="xlarge")