That’s an interesting fact. I fast often. If 1’m doing a long hour fast from 6 to 6, I tend to do a day or max 3 days. And eat fruits and take plenty of water during that period. But if it’s more than 7 days, I do 6 or 8 hours and take plenty of water. If it’s not a dry fast I don’t do longer than 13 hrs a day.