Verified answer

It's up to you. When you finish saying what you want to say in that chapter, you end it and start with a new chapter. You don't need to set a target for chapters either, as long as you get to say all you want to say in your book.

Nope,i dont agree with the previous answer, i think you should write from 1000 to 2500 words to not keep it short or long and boring!