Couldn’t tell you – I have no intention of ever stopping. I have had the occasional week of not fasting for holidays etc. and I can confirm that (at least some) health benefits reduce quite quickly when I take a ‘break’, so I don’t intend to stop for more than a week at a time EVER for the rest of my life. When I get to maintenance I will keep up some form of fasting, either 16:8 or 5:2/6:1 with a higher calorie allowance on ‘off days’.