In undergrad I did zero reading for fun. I studied philosophy at a liberal arts school. My reading lists and class schedule didn’t allow for unassigned books.

In grad school I only had maybe 9-hours of in-person, seminar time each week which gave a lot more time for outside work. And our only exams were big papers due at the end of each semester, but with 2-3 weeks free of classes to work on them. I was able to structure my academic work to a pretty basic 9-5 schedule and I held myself to it. I did fun reading in the evenings. It was the best.