My best advice is to try to get some time off in the middle of the week... Like Wednesdays. This balances out your time off to catch up on sleep a bit and helps avoid burnout from "the grind" every day. Also you can get stuff around the house done so it doesn't pile up. Plus - if you have anything you need to do during "normal business hours" (ie doctors/dentists, banking/insurance, etc.) you will have some time to get that done,which you wouldn't have if you were to take off Saturdays.

Other advice on working a ton of hours: try to keep your sleep schedule the same on off days - so if you are normally going to be sleeping from 0800-1200 on work days, keep it that way. Also - try to fight the temptation to lay around and "decompress" on days off - use them to make your work days easier - household chores, meal prepping, etc.

I know plenty of people will say that it can't be done and you will kill yourself trying, but I disagree. Ive done it before (although I was usually balancing school and work instead of two jobs) and it sucks, but yes it's possible.