I can't answer that, but sometimes I feel like having a job that allows me to be in my own world would be great for a little while. I've been between jobs and considered joining a cleaning service cleaning offices in the evenings to make a few bucks. I imagine it's great bc you really don't have to socialize that much and pretend to love your job. You don't have to pretend to be super cheerful and pleasant and I imagine you get a lot of time to yourself.

12 hours a day seems like a lot to take take on from jump if you've never had a job where you've been on your feet for extended periods of time.

While I haven't been to a mall in a long time (I hate shopping) the times I've gone I've never seen anyone treating the janitors like garbage, that's not to say it won't happen. If it turns out you don't like the gig bc of bullying (if it happens) or the hours are too much on you, and you want to stay in the cleaning service for now, see if you can find a service that allows you to clean offices in the evening or even schools.

Good luck!