I generally have the first session of her day so my T appointments pretty much start on time. If I had a later appointment, I would think that the one prior to mine has gone overtime for a good reason and I respect the needs of the client ahead of me.

My pdoc incidentally is often late by as much as 30min. In some cases, if my appointment is at the end of day and he is running late I get a courtesy call from his office. But there have been times I sit and sit outside his door. When he has run late I can usually tell from the tones of the voices within that something is up and quite serious with the prior patient.

If either were more than 30min late, I'd demand a rescheduling of the appointment.