Granted my business partner and I employ a fulltime office manager to handle a great deal of our practice management needs, but in my own practice I would put the ratio over the course of a year at about 5 hours of "practice management" work for every 30 hours of clinical care that I do. Basically for my standard 30 hours of clinical care that I'm booked a week, I do about another 1/2 day per week in practice management work. And some of those 5 hours a week aren't spent just going over numbers on my computer at my desk, but in business discussions with my business partner and often office manager at lunch.