Law students and lawyers are not similarly situated. Speaking from the attorney perspectie, if you work 60 hours per week, you cannot take a premed course on top of that and hope to do it justice. It's simply too important to get A's in the prereqs if you hope to go down this road. Plus you are going to need to be working in some clinical experience on top of this, this is effectively a "prereq" for admission to med school these days. And ultimately studying for the MCAT on top of all this, as well as applying/interviewing. So honestly at some point it will be necessary to quit such a job, maybe do contract work part-time, but clean out your schedule so you can devote the majority to classwork. Little by little might be the way you start initially, but few find it gives you the opportunity to devote adequate time to the coursework, and law has a nasty habit of getting busy when you can least afford it. So yeah, I'd say the majority of full time lawyers quit their jobs at some point during the postbac process. It's a lot like stepping off a cliff -- you have to be sure of your abilities in this endeavor, and work without a safety net.