Mine often says, "I need to check on who's waiting," and he opens the door to the waiting room and says he'll be out in a few minutes. Then he comes back to me and I know we need to wrap up. Or sometimes he says "Should we look at the calendar?" and he goes to his desk and gets the calendar so we can schedule a session for next time. It's all pretty seamless and not too abrupt.

Soliaree, I think the Dinging timer is kind of rude. Like you're a 3 minute egg that has to cook an exact amount of time. You're more than an egg, you're a human being! I can imagine that Ding would be very disruptive and jarring. I wonder why your T can't learn to manage his time better without a timer? It might be worth asking why he needs a timer and can't just look at a clock? Or if he really needs an alarm to remind him that your session is up, he could use the vibrating cell phone in his pocket as someone here already mentioned. The fact that he doesn't use one of these more subtle methods says to me that his use of the Dinging timer is very deliberate and serves some need of his--perhaps an expression of power over his clients. I'm not sure, but I think it is saying something about him. Would he allow you to explore this with him? Maybe if you understood the why behind the timer (rather than a more gentle method), it would make it easier to tolerate for you.

Have you ever tried asking him not to use it in your sessions?