I have a high hourly rate and therefore allow for overtime. So if I show up, the person wants to get acquainted, etc I let that time just pass. My rule is once the action starts then I check the time on a clock in the room, and begin the hour of the session. Then I’ll it from there. All in all, about an hour of service but 2 hours in total of being together. I just plan for overages and charge accordingly upfront