That is one of the most absurd, asinine and brain dead policies I have ever heard. These scum sucking, knuckle dragging Cretins are actually in charge of our children? Really? And we allow this kind of insanity? When has going to the rest room ever been a problem...and even if it is a problem, what kind of momentous infringement on the establishment can it be? Do the teachers have to stay overtime a couple of minutes? Do they have to cut short their smoke break?
The only time I can ever remember it being a problem (Yeah, I completed grade 1 through 12) was when they served the old WWII surplus canned beef in the lunchroom, and the restrooms were standing only about 2:00. Even so, classes went on as they always do.