I'm going to college part time and I need to attend certain classes for hours at a time when I need to do testing. We're told to go to the bathroom before the testing begins and are reminded a few times and they give us a quick 5 minute break in the middle but it's pretty strict. If you have any similar situations where you need to be in diapers in a public area for long periods of time and you're worried about soiling your diaper you might be interested in a technique I use. I don't use it much because of dependence issues, but I keep a bunch of disposable Fleet enemas in my apartment. I'll use an enema right before I change into my diaper for the day and head out the door. I find that it 'clears me out' and really extends the amount of time that I can go without soiling myself. I hope it helps!
