How long will you wait for an appointment? [POLL]

I totally understand that people run late, it is just part of life but how long will you wait for someone or something? I was at an appointment the other day and I ended up waiting about an hour past my appointment before I was helped. During my hour wait I found myself trying to decide if I was going to wait it out or if I was going to leave and reschedule.

This can be a hard situation to be in because even if you do leave you still have to reschedule the same appointment so is it better to just wait it out?