They are allowed to, but I wonder how many are interested?

I'm not. I work M-F from 7-5:30 and that's it. I bartended for years because the hours meant I didn't need childcare for my own kids...DH and I worked opposite shifts. It was stressful of our marriage and for our children to not have us together very often so that was one of the reasons I switched over to home daycare. Because of my previous work experiences I am not interested in working evenings or weekends at all. I must give off that vibe because I've never had anyone ask.