Single foster parents - How many kids?

Single mom. I work 9-5 but I commute, so I'm gone from 7 to 7. My support system is iffy. When my mom was alive, she would watch the kids when daycare was over or if they were sick or suspended from school. I use vacation days for doctor appointments. My range was newborn to 12. I had a teenage foster son who was 14 when I got him. Visits were on the weekends. The problem I had was I didn't keep their world small which impeded their healing. Go with your gut; I didn't have the fortitude to deal with a teenager and I should have said "no".