You're an interviewer. You have a 12:00 interview scheduled. Normally people go in the mildly annoying direction of arriving waaayy too early, but this candidate is late.
How late can the candidate be before you (a) hold it against him/her, and (b) cancel the interview altogether?
I consider lateness of more than a couple minutes very notable. And at 10 minutes, there better be a profuse apology so it doesn't seem like typical behavior for the candidate. If the person isn't there 15 minutes after the scheduled time, I'm likely to cancel the interview entirely. (If the person calls within the first 10 minutes to explain and has a reasonable excuse, I will cut them some slack, but not a huge amount.)
Where do you stand?