My group doesn't have a rule about hours. I suppose you could work every day if you are insane. Most of us work about 150 hours per month. That's what I do. Some guys will work 180- 200 here and ther if they need the money but that gets very draining. My group doesn't care if you moonlight. If a group has an hour restriction because they want to evenly distribute the available shifts then they probably won't care if you moonlight. If their restriction is based on an attitude about performance and hours then they make make a fuss.