I could never imagine doing that3 days... I was mainly asleep during that time and drinking water... Dark times.
when I was younger I would fast (i was a mormon as a child) for like 5 days, but then there would be times where we could break fast at a certain time where we would eat so it would be probably no eating for like 12-18 hours sort of thing, not like we have much to eat back then anyway lol