I'm not in grad school yet, but I currently work in a residential setting with adults with disabilities. I work full time during the week, but we have a number of part time staff that come in on Friday evenings and leave on Sundays. They end up getting paid for almost 30 hours in that time period and it's pretty laid back with usually quite a bit of downtime that many use for studying, etc. This is in Texas, but you might look into something like that wherever you are!