reduce zerogpu duration

app.py

@@ -59,7 +59,7 @@ def read_int_env(name: str, default: int) -> int:
 
 
 ZERO_GPU_SIZE = (os.environ.get("SYNLAYERS_ZERO_GPU_SIZE", "large").strip() or "large").lower()
-ZERO_GPU_DURATION = max(60, read_int_env("SYNLAYERS_ZERO_GPU_DURATION", 900))
+ZERO_GPU_DURATION = max(60, read_int_env("SYNLAYERS_ZERO_GPU_DURATION", 300))
 
 
 def list_example_images(limit: int = 6) -> list[list[str]]: