I said once, but I think it would also depend if I "won" in the case of more than one. I think ex-T double-booked me once early on (this was like 8 years ago), but I said I could come later than day. Another time she did but let me be the one who stayed, while the other person rescheduled. Actually, I don't think that was a double-booking though--I think the other person was mistaken and had written the wrong time down. Dr. T has never double-booked me, though he said he has with past clients before.

I think much of it depends on the circumstances, past history, how apologetic they are, and how they make up for it in terms of whether I'd be willing to put up with it more than once (I figure everyone is granted one mistake). If it happened twice in 6 months, that's different from it happening twice in 5 years, say. Or if it happened at a time when I was in a really bad place and/or the T and I were in the midst of a rupture, it would be harder for me to move past it, even if it was only the one time.