What's the longest you ever gone without eating? Do you fast or follow any diets...

15 days
just because I know I am capable of doing so

>I'm gonna start eating only once a day
I already do it everyday for several years. But I eat a lot during that one meal.
Personally, the longest time without eating I had was 5 days.
I often do 3 days fast (before going to an all you can eat buffet) but I follow a strict method to not have my stomach small.
The 5 day fast was due to a particularly big binge I've done. Was digesting for three days and wasn't hungry 2 days after