The ABA limits it to 20 hours. Some schools do make you sign contracts (I know Rutgers made my partner sign one.)
Plenty of people have no "choice" but to work during 1L and they manage. Beyond that, there are plenty of part-time students who are only doing only 3-4 credit hours less than full-timers, but working 40+ hour jobs and raising families too.
It's amazing what people can manage when they have to.
It'll make law school more challenging, but it's better than being homeless!
I'll be working 15 hours a week in a leadership position at work, but my hours are flexible and work-from-home and mostly done via the computer. I'd love not to work, but I can't afford not to - and, I think it'll be a nice little relief from LS too.