Two of the ts that I see are quite busy. If I want the same time/same day I have to schedule ahead a few months. I scheduled December and January today. They are first come, first served but to be first, I just have to stay on top of my calendar. There is a receptionist at the practice who does the scheduling. Occasionally one of them has told the receptionist to schedule me in a time slot that is usually not available. I assume they do this for clients who unexpectedly need to get in.
The other t never schedules anyone for my time slots. Occasionally one of us will have a conflict and we schedule for a different time. I try to be very flexible with him because he is so flexible with me.
It would not be a big deal for me to see any of them at more varying times, it's just easier for me to have a set schedule.