I agree with everything posted. If running late, I let them know even if I'm only going to be 5 minutes late.
And if I arrive and get no response, I'll usually wait 10 minutes, then send another text. And if no response in 5-7 minutes I leave.
Funny thing is, a few times I've received a txt about 10-15 minutes after I've left with some sort of apology and that they're ready to see me. And then they get mad when I say I'm not there anymore.
LTO_3