I provide hourly support and my billable hours vary based on the client. I have one client that averages 20 hours per week and I have some that average 2 hours a month. It all depends on the client. I try to keep my billable hours to around 30 which leaves me an additional 10 hours a week for overhead work. I do my best to only work 40 hours a week.
Not sure if that really answers your question.
