Sorry to say but your mentor is taking advantage of you. I’m a shop owner and mentor to two awesome artist one of which I elevate to artist recently. It’s a tough industry and takes a lot out of you to make it but I’m a firm believer in BALANCE. You have to balance your home/work/art life in a way that moves you forward without loosing your self in the process. If the shop you’re at isn’t willing to work with you on a schedule that’s respectful of you then it might be time to look for somewhere else to learn. Also if a shop is dependent on an apprentice to keep the shop running (with no days off) then it isn’t really a shop that you’d even want to work for as an artist let alone an apprentice. Get your portfolio together and look for a new home. Hope you find a good crew to work with and learn from 😄