I honestly really disliked when students would get up to go to the bathroom during a 50 minute class (which was realistically more like a 40 minute class with all the stragglers) - unless your class is 6+ hours long, there’s really no reason to use the bathroom during class.
4+ page essays don’t seem to excessive at all, really. If you hunkered down in the library, you could easily bang one out in 1.5 hours or less if you stayed focused.