They have squatter toilets there, 2 minutes is plenty of time!
Unless of course you have the case of the bends (diahrreah), and have to keep running back and forth there. Or, you are hovered over that hole in the ground puking your guts out because you are forced to work while sick. (Contractual thing or maybe their labor is so bad - remember the suicides that Apple had at their iPad/iPod plant, that is what me thinks it is so strict.)
Then of course, you have those that maybe had that extra hard meal on their body that now requires a laxitive. Probably takes at least 1 minute to walk across the hall/building/floor wherever to use the restroom let alone back.
They clearly knew what they were doing when they put this into effect knowing that each laboror would rather work than lose their job as a result of such tight restrictions.
When I was a call center drone - I would have no more than 6 1/2 minutes for a restroom break per day which for the most part was good until you had to run across the call center floor to the other one because the men's room was in use. For guys, it is pretty quick to use the restroom anyway, not sure about women. My wife is pretty quick in the bathroom herself, but I have known a few to take several minutes. Most of the time spent, checking hair, fixing makeup, updating Facebook status etc...
Bottom line - I agree that limits should be put in place, but 2 minutes is practically inhumane. You should next time you are at work/school and have to use the facilities pull up your stopwatch app on your phone, or watch whatever, and time yourself. Sure as heck, it will probably be 3 minutes total. (Unless you sit right next to a bathroom - in that case, I feel sorry for you)