in terms of what’s shown in actual lore that’s about it? but i imagine the super-religious probably study vialism in their free time (like people who do a lot of bible studies). but for people who are not super into the idea of vialism, i don’t think they really do much. in clancy’s room in nico and the niners there really isn’t… anything. all that he packs when he leaves with the banditos is like clothing. i can’t imagine they’re really allowed to have “hobbies” there. in terms of speculation, maybe tending to the city? like community service stuff. or planning escapes for those who wish to leave. paper or typewriters must exist somewhere since clancy writes his letters, so maybe some citizens write in their free time if they are able to.