a bit more time tuning :)

app.py

@@ -92,9 +92,9 @@ def get_duration(input_audio, model_id: str, do_inversion: bool,
         raise gr.Error('Input audio missing!')
     duration = min(utils.get_duration(input_audio), 30)
 
-    time_per_iter_of_full = factor * ((t_start /100 * steps)*2 + mult) * 0.2
+    time_per_iter_of_full = factor * ((t_start /100 * steps)*2 + mult) * 0.25
     print('expected time:', time_per_iter_of_full / 30 * duration)
-    return time_per_iter_of_full / 30 * duration
+    return min(15, time_per_iter_of_full / 30 * duration)
     
 
 @spaces.GPU(duration=get_duration)