make zerogpu duration dynamic to avoid GPU task abort errors

app.py

@@ -145,7 +145,19 @@ pipe = QwenImageEditPipeline.from_pretrained("Qwen/Qwen-Image-Edit", torch_dtype
 MAX_SEED = np.iinfo(np.int32).max
 
 # --- Main Inference Function (with hardcoded negative prompt) ---
-@spaces.GPU(duration=120)
+def get_duration(
+    image,
+    prompt,
+    seed,
+    randomize_seed,
+    true_guidance_scale,
+    num_inference_steps,
+    rewrite_prompt,
+    progress
+):
+    return num_inference_steps * 3
+
+@spaces.GPU(duration=get_duration)
 def infer(
     image,
     prompt,