I don't count exactly but somewhere from 4-5. Difficult chapters get more love. My first draft is technically a screenplay that I wrote a few years ago, that I've been novalizing. Then draft two is my mess of a chapter that usally has a lot of fixing. Draft three I fix most of it. And then draft four I go over for grammar and anything left. If there's a draft five that's usualy because there was a difficult scene for me somewhere that I needed to think about more.
I'd love to have a round of beta readers for my drafts eventually and an actual editor but I can't really afford that right now.