I work FT and go to law school PT. I give up every single weekend, both days, to do it. Some of my classmates are able to either study after class, but I'm just not physically able to study at 9pm at night after a 13-14 hour day.
1L I did substantive work on Saturdays and legal writing on Sundays. This year I'm doing substantive work on Saturdays and law review on Sunday. So if I wasn't doing LR, I would actually have a day off.
If you can afford to work PT, I would highly recommend it. 8-10 less hours means you can get all your substantive class studying done during the week, and some of your legal writing as well. My employer wouldn't go for PT.