Not accurately measured but at least 2 min because 4 or 5 persons finished their pee beside my position during my peeing.
It was a class with 1 hour and a half long. I was bursting shortly after the begin of the class and about to wet myself only half hour into the class. I used every technique I know to hold my pee in and lasted to the end of the class. I never hold that much again. I think it is a miracle that I did not pee in the class that day.