ZeroGPU duration 75 s: ~2x a measured run, two anonymous runs a day

README.md

@@ -156,11 +156,13 @@ The fixed settings — 512 images at 100 ODE steps — take **~85 s on an A40**
 scales linearly in both, so a section that needs to be faster should lower them in
 `pipeline.py` (`NUM_IMAGES`, `NUM_STEPS`).
 
-On ZeroGPU the per-call budget is set by `ZEROGPU_DURATION` (default 120 s). Keep it
+On ZeroGPU the per-call budget is set by `ZEROGPU_DURATION` (default 75 s). Keep it
 close to what a run needs: `spaces` requests 1.5× it on the default GPU size, and ZeroGPU
-refuses any request above the visitor's allowance before running anything — at 300 s
-(450 s requested) every visitor without PRO was turned away with "The requested GPU
-duration (450s) is larger than the maximum allowed".
+admits a run only when the visitor's remaining daily quota covers the whole request, while
+charging only the time used. A titration takes ~56 s on ZeroGPU (measured 2026-10-16), so
+75 s requests ~113 s — twice the run, and two runs a day on an anonymous visitor's ~180 s;
+signed-in visitors get more. At 300 s (450 s requested) every visitor without PRO was
+turned away with "The requested GPU duration (450s) is larger than the maximum allowed".
 
 ---
 

app.py

@@ -46,10 +46,12 @@ except Exception as exc:  # never let the shim take the app down
 try:
     import spaces
 
-    # What a run needs, not a safe-looking maximum: spaces requests 1.5x this (the 'large' GPU
-    # size), and ZeroGPU refuses outright any request above the visitor's allowance -- at 300 s
-    # (450 s requested) every visitor without PRO got "larger than the maximum allowed".
-    GPU_DECORATOR = spaces.GPU(duration=int(os.environ.get("ZEROGPU_DURATION", "120")))
+    # What a run needs, not a safe-looking maximum. spaces requests 1.5x this (the 'large' GPU
+    # size), and ZeroGPU admits a run only if the visitor's remaining daily quota covers the whole
+    # request, though it charges only the time used. A titration takes ~56 s on ZeroGPU
+    # (2026-10-16), so 75 s requests ~113 s: twice that, and two runs a day on an anonymous
+    # visitor's ~180 s. At 300 s (450 s requested) every visitor without PRO was refused.
+    GPU_DECORATOR = spaces.GPU(duration=int(os.environ.get("ZEROGPU_DURATION", "75")))
 except Exception:  # running locally or on a dedicated GPU
     def GPU_DECORATOR(fn):
         return fn