It's doubtful he's having a stroke or anything like that 3 times a week, or doing coke 3 times a week, besides, a person can do coke faster than they can pee, so one wouldn't be in there for long periods, but rather very often. LW should feel lucky she DOESN'T know what he was doing: at least he's not "fumigating" the place, if you get my drift.
Chances are that if you say something to the guy and he takes it the wrong way, or is just a jerk anyways, it'll change from 3 times a wee k to 3 times a DAY, every day.