I HAVE walked out after waiting half an hour. A doc I didn't much care for, I had already started looking to find a replacement. As I recall, I didn't tell them when I left, either. snippy, eh?

I agree with the other comments, if you trust the doc, don't change. However, I would say let them know how upsetting it is. If you don't have a strong bond with the doc, find another.

To me, the only ones who should be allowed the leeway are the surgeons, coming in from surgery (usually it is the morning appts., not always, depends on the surgeon's schedule). Otherwise, I don't see more than 5 or 10 mintues as permissible, and they should APOLOGIZE for being behind schedule.