 I've been doing this for many, many years and I've tried it all. And honestly, I always go back to that simple 16-8 method. 16-hour fasting, 8-hour eating window. So you go, how long do you fast for every day? 16 hours. So typically you would sleep for half that time. So you're really fasting for 8 hours that you are awake. So a few hours after your last meal at night.