You can pass uni doing about 10-12 hours a week then 30-40 hour in the final few months so really you have a lot of time to play about. (depending on course and uni)
At the time I thought it was hard work. Then I entered employment and realised it was rather straightforward!
Found it the other way around.
Uni was hard, work is easier. Uni is grilling and tedious. Work is practical but a lot more people managing.