The problem in my jurisdiction is we aren't allowed to use the restroom at lunch and the MPT is in the afternoon. So that's like 4+ hours, plus it's right after you eat and have to drink at least a little water (I mean I guess you could completely refrain, but my throat is always a bit dry and even scratchy after eating if I don't drink anything at all). I think I'm going to try to finish my essays early-ish and use the restroom right before lunch, and maybe even keep a bottle in my car or something in case I am really worried about having to go (I know that's disgusting.. but I'm stressed out about time on the MP, and I refuse to wear a diaper).

I could definitely see wearing an adult diaper just in case you truly have an emergency and don't feel like you can take out the time to go to the bathroom (like I could see wearing one giving someone peace of mind), but I couldn't imagine actually using it. I agree that sitting in your urine should be an absolute last resort and is probably more distracting than taking time out to pee.