8 days...it was last winter when i went on an Ice Trek - i was eating 3 MRE's a day and each MRE carries an average of 1300 calories in it. i'd eat most of the meal and save the snacks...so i was putting a lot of food in my system to not go for 8 days, plus it was under -10 degrees for the whole trip, so i really didn't want to go.
probably only two or three days. what happens when you hold your shit in for 8 days? That sounds impossible, and painful. would it stretch your intestines?
it was very painful when i got back to school. something i don't ever want to do again. but out in the field, when its that cold and your moving constantly doing a whole bunch of training, you don't think about going the bathroom...you think about keeping warm. but yea, i wouldn't advise anyone to hold it in.