Lots and lots of great info on gear and techniques, but what about the business end of running a studio? In particular, I'm interested in booking and billing. How do you include setup, mixdown, mastering, etc in your bookings? Say, for example, a client books 20 hours, do you record 20 hours or do you block off, say, 5 of them for the above? How is this determined? Lot's of question, I know, but this is an aspect that I never really came to a resolve on. Some clients I charge one way, some another way...usually dependant on thier situation.