How do you do intermittent fasting? Most IF'ers eat for 8 hours a day, not eating the various other 16 hrs. For how long do you have to quick for intermittent fasting? You could begin with a 12-hour quick as well as function your means to 16 hrs. The majority of IFer's consume from 10-6, 11-7, or 12-8. It does not matter exactly what eating window