Also – which hours are considered “at night”? Does “night” start from 3:30 and continue til 9? or is it literally a person that is in college just when it is dark outside? Meaning he learns in kollel the whole day and then goes to college at night as an aside – maybe 1 or 2 classes each semester.
It probably varies from program to program.
For me, it meant seder until 5:30, so I could make a 6:00 class. When there was no class (legal holidays, between semesters, etc.) then I stayed until the end of the day (7:30 or 8:00 IIRC — it was quite a while ago).
In any event, I can’t imagine someone going to college at night ending later than 5:30 – 6:00. There aren’t too many colleges that start classes at 9:00 PM.
The Wolf