Reduce GPU duration to 120s to be more efficient with Zero GPU quota

mvp.py

@@ -1126,7 +1126,7 @@ def visualize_detections(target_dir, conf_thres, frame_filter="All", mask_black_
     
     return out_path, legend_md
 
-@spaces.GPU(duration=300)  # 5 minutes for full pipeline on Zero GPU
+@spaces.GPU(duration=120)  # 2 minutes for full pipeline on Zero GPU
 def detect_objects(text_labels, target_dir, conf_thres, *viz_args):
     """
     Detect objects from text labels and return the detected objects.