I punched the numbers into the old calculator out of curiosity. To gain 100 lbs in 14 days you would have to overeat by 25,000 calories every day. For a deathfat at a cruise ship buffet this is depressingly possible. I'm triathlon training right now and feel like I have to stuff my face constantly to hit 2500-3000 cal and the right macros. 25k sounds insane. But possible for a my600life superstar.