I did a science degree back in the mid 90s. We had roughly 36 hours per week between lectures, tutorials and labs. And due to pressure on lab spaces, 2 years we had labs at night (6-9pm). Every year we started at 9am every day (except in final year, I only had 4 9ams and 1 was a 10am start!).
Then we had to write up the labs, do problems for the tutorials, a few essays or projects each term, out side of the actual teaching hours.
And reading/study on top of those again.
I went to 1 adventurous Society meeting a week (1 hour over lunch), met students and graduates from that some weeks for drinks (those free would go to the cinema in the afternoon on Wednesday - I managed 2 movies in 4 years!, and all would meet in a specific pub that night including graduates now working), I went to a debating society most Saturday nights and a couple of midweek events of theirs (maybe 5 in 4 years), and I had about 4 weekends away with the adventurous Society annually. And I only trained once a fortnight with my sports team (preferred a team outside of Uni but it was local enough I could still get there) but played most Sunday mornings in the matches.
But my subject ate up a huge amount of my time. And it wasn't the most technical of science/technical subjects. Food Business Engineering was a class that had 46 hours timetabled per week. And groups like medicine, dentistry, veterinary, engineering all had huge timetable loads as well.
History - huge amount of reading and essay writing despite not so many timetabled hours. Same for law, English, psychology, etc.
Business was a reasonable mix, more structured, still a lot of reading and lots of group project work.
But the Arts, Law, Music and Business faculties all seemed a lot more fun than anything science related in terms of time off and social lives.
On the flip side, all the technical Faculties tended to be grouped on 1 side of campus, and tended to have our own types of fun (I really enjoyed my time in Uni , in case it sounds like I didn't).