At LSE, it is quite normal to have 2-3 days that are very busy and to have 1-2 days that you have hardly any lectures/classes. It is also quite common that you have an awkward break in the middle of the day in which it doesn’t make sense to walk all the way back to your dorm room, so you have to stay on campus and presumably study in the library. I have such a break from 12:00 to 5:00 on Fridays. If I walk there and back it is 45 minutes of time wasted so I generally stay in the library for about 4 hours (after a lunch break). At times, I get a lot of work done, but it can also be quite brutal.