In the mid-60's normal pub hours in Liverpool were 12:00 to 3:00 at lunchtime (yes... quaint drinking hours rules)
But the University Student Union cafeteria/bar had to close at 2:00 so students would get to their afternoon classes....:^) No-one left 'til the bar closed...
I was an undergrad at Michigan in the early 70s. I saw all kinds of drug activity going on. I have to admit I was more taken aback by the student drinking in the middle of the day than any drug scene in Ann Arbor.