>>19731596I can't say with 100% certainty, but bag's longer videos have pretty clear "sections" where one action ends and another begins. Thsi probably means that he uses the last frame of the first vid as the first frame of the second vid and so on.
Likeness can drift away, artifacts can show up, etc. For instance if the last frame has a streak of cum mid-air, the first img will see that cum as a static object without momentum.
Wan uses VRAM based on the sum of all aspects of a vid. More pixels, more loras, more frames, those all increase VRAM use. And when you're out of VRAM you're out of frames. I can do a 10 sec vid of 480*480 in one go, but not a 10 sec 832*480 vid.