Of course s/he should find a balance. I wasn't prescribing a regimen, just pointing out there is time- one can study more/less, sleep more/less, but my point was there is time even when working 10 hours a day you can make time to study if you manage your time wisely.
I'm assuming s/he's not working 10 hours a day 7 days a week (which is why I asked about weekends), and I also asked if the Kaplan course fit with the work schedule. I wasn't recommending a plan where you work every day of the week and study every day of the week, just pointing out that even when working 10 hours a day there is still time to study, sleep, have some off time, and could even be time to take a class (evening or weekends) depending on when you work.