Time away from kids

I am realizing I can go months before I have time without my children. If I need to go anywhere all or some come with me. I'm wondering as a stay at home mom if this is common? I'm trying to carve out time for things I need to do and I'm finding I just adapt with kids with me such as grocery shopping, working out, family stuff. This past month I got away one night to watch my brother's children and two hours to get my hair retouched. The month before one afternoon to decorate for a birthday I was throwing. If I get time away it's normally to help others. How do other stay at home moms do it. Next month I have surgery for a breast lump removal (praying it's nothing) but that will be my only time away from my kids. I could use a break like a real one.