How long would you wait...

The only time it happened to me it was over an hour and I went to the receptionist and said I was leaving soon, she apologized and I got in shortly after that. I think it's best to give them a chance and not just leave, otherwise you consume more of your time coming back again. I don't think they do it on purpose but it does make you feel abused.
I hate this also, but my family doctor told me , that the paperwork was (computer) so bad that he had to do it after every patient to keep up w/ it- thanks to hussien Obama`s crap that the american dumbasses fell for. also obama care, is now making millions of americans insurance go way up.