adaptive: GPU duration from WAN_GPU_DURATION env (free-safe default 150); no code change needed for PRO upgrade

app.py

@@ -64,6 +64,13 @@ _NEGATIVE_PROMPT = (
 _pipes = {}
 _lock = threading.Lock()
 
+# ZeroGPU GPU session budget per request. Kept env-driven so the account can
+# move between Free and PRO tiers WITHOUT code edits — raise it from the Space
+# settings (WAN_GPU_DURATION) when the HF account upgrades.
+#   Free tier: per-call cap is small (default 150 is safe; effective ×1.5 = 225s)
+#   PRO tier:  cap large (recommend 600 -> effective 900s, well under 2400s)
+_GPU_DURATION = int(os.getenv("WAN_GPU_DURATION", "150"))
+
 _DEBUG_LOG = "/data/motion-debug.log"
 
 
@@ -170,7 +177,7 @@ def _save_video(frames, prefix):
     return out
 
 
-@spaces.GPU(duration=300)
+@spaces.GPU(duration=_GPU_DURATION)
 def image_to_video(image, prompt):
     try:
         pipe = _i2v_pipe()
@@ -193,7 +200,7 @@ def image_to_video(image, prompt):
         raise
 
 
-@spaces.GPU(duration=300)
+@spaces.GPU(duration=_GPU_DURATION)
 def text_to_video(prompt):
     try:
         text = str(prompt or "").strip()
@@ -224,7 +231,7 @@ def text_to_video(prompt):
         raise
 
 
-@spaces.GPU(duration=300)
+@spaces.GPU(duration=_GPU_DURATION)
 def video_to_video(video, prompt, strength=0.7):
     try:
         text = str(prompt or "").strip()
@@ -251,7 +258,7 @@ def video_to_video(video, prompt, strength=0.7):
         raise
 
 
-@spaces.GPU(duration=300)
+@spaces.GPU(duration=_GPU_DURATION)
 def character_animate(reference_video, character_image, mode="animation"):
     try:
         mode = str(mode or "animation").lower()