Ok that's what I understood as well (about the length of it)
There is a difference in effect from fasting the longer it goes. I’m not sure about how different a fast is for a fat adapted person vs non. I’m sure you can find a talk specifically on that by either Dr. Cywes, Dr. Eric Westman or Dr nostr:npub1kyk7ac33apd7cx0nun3laevf84zfhr8pt8kj4h8v7cpx9t72d4gqkyea0g