I agree with almost everything that @/rachelonepisode said, but just one thing: I wouldn’t read a chapter that is one hour long, I have read one story that I trully liked but stopped reading it because just 1 episode would be that long. I always make my chapters around 10-15-20 minutes long. I think that’s the best.
Other than that I would never make my chapters less than 10 minutes as the person said, in my opinion 3 minutes is a very bad idea. It’s not fun. But also I believe that 1 hour can be boring and make the readers tired.
In conclusion, I believe that 10-20 minutes long is the best offer in our store 