I was at a studio where most of the teachers worked full time jobs during the day till between 4 and 6pm then would teach at the studio until 10pm. Didn't make for a very successful studio though. Teachers could never fully commit to their teaching/dancing, so students were scarce or rarely came back. In fact, the studio once had one of their top students demand a refund for the rest of his program (2 lessons/week for 2 months @ $90/hour = $1440) which sent them into the red and they couldn't pay the teachers that month. I got out of there soon after. I also knew a teacher who took Master's classes in the morning then worked at a studio from 1-10pm. But she soon fell by the way side. I have taken part time jobs while teaching, but even 8 hours a week at something else left me feeling exhausted and distracted. But once I was at a studio that only paid $10/lesson, so I needed it.