This is a workflow uses the Scail 2 model and a custom node to generate long videos without for loop. NO visible quality degradation wihtin 60 seconds.

if you don't have the hardware to run this workflow locally, you could try this online version for free.
Workflow: SCAIL 2 Character Animation&Replacement Long Video

Experience link: https://www.runninghub.ai/post/2072986058291240962

if you are new to ComfyUI , you could check this intro video for ComfyUI