Men generally have better results with 8 or 6 hours windows. It's usually recommended that women have a 10 or 8 hour window, though I don't know the specific re

Men generally have better results with 8 or 6 hours windows. It's usually recommended that women have a 10 or 8 hour window, though I don't know the specific reasons. There are a few diets that recommend an "all you can eat" 4 hour window, but recommend only going that route if you don't have the discipline for a 8 or 6 hour window. Also note that studies have shown that it takes more than 24 hours of fasting for people who are diabetic or prediabetic to have similar results to those who show no signs of diabetes fasting for only 12-16 hours.