Pro tip. Study in 50 or 55 minute increments. Start at 5:05/5:00 and end at 5:55. Makes the time you dedicate feel significantly shorter (I mean it is by 5/10 minutes but you get my point) as it's in the same hour. It also fits the college class schedule style. Those 60 minute class timeslots always feel so much better than the 90 minute ones do.

I don't actually ever stop at the correct time. But actually starting it is the hardest part. Treating it like a quick class period helps me.