Update README.md

README.md

@@ -69,6 +69,22 @@ gr.Interface(
 
 Note that `@spaces.GPU` is effect-free and can be safely used on non-ZeroGPU environments
 
+## Duration
+
+If you expect your GPU function to take more than __60s__ then you need to specify a `duration` param in the decorator like:
+
+```python
+@spaces.GPU(duration=120)
+def generate(prompt):
+   return pipe(prompt).images
+```
+
+It will set the maximum duration of your function call to 120s.
+
+You can also specify a duration if you know that your function will take far less than the 60s default.
+
+The lower the duration, the higher priority your Space visitors will have in the queue
+
 # Early access
 
 Feel free to join this organization if you want to try ZeroGPU as a Space author. ✋ We should accept you shortly after checking your HF profile