Okay so I know some of you are wondering how many pages does my book have to be? and I have the answer for you. But, actually, it doesn't matter how many pages your book or novel is. It matters how many words your novel has.
Sifi and fantasy books can be anywhere up to 150, 000 words.
Middle Grade -- up to 50, 000 words.
Kids books are very short. You can look at one and decide for yourself, there is no specific word limit. It just has to be short.
Teen -- 50, 000--to--80, 000 words.
Nonfiction books can be any amount of words, as long as it's over 50, 000 words.
I hope this helps.