I think everyone else has said it all already. I'd be very annoyed in that situation. The clock sits behind me in therapy too. I no longer have a watch and so it's T's responsibility to keep the time. She's said the same thing herself. Your T can't just decide to go over and charge you extra without letting you know. That's ridiculous. So your T expects clients to watch the time themselves and bring their own sessions to an end unless they want to be unexpectedly charged more? Might help is that was made clear from the beginning, but I can't imagine too many people sticking around if a T wasn't willing to keep their own time.