I do roughly a 16:8 split most days 16 hours fasting and 8 hours feeding window. Generally stop eating sometime between 6:30 PM and 8 PM in the evening and don

I do roughly a 16:8 split most days 16 hours fasting and 8 hours feeding window. Generally stop eating sometime between 6:30 PM and 8 PM in the evening and don't eat again until noon or later the following day. So some days the fast gets as long as 18 or 19 hours. I do intellectual work both fasted and during the feeding window. After doing this for 3 years or so it feels completely normal. It is also very possible to exercise intensely (weight lifting and running) after fasting 15 or 16 hours. I believe that this approach helps me maintain the body weight and fitness levels that I desire without being particularly difficult to do.