My T normally has an alarm that goes off-- it sort of sounds like a fire alarm. When this happens I jump up and immediately evacuate the office.

Ok, no. We usually go about 15 minutes over or so and he really doesn't have to say anything; I can sense the end of a session. Sometimes if I am in really deep with something he'll tell me, "We have about 15 minutes left." He'll usually do something at the very end that I can "carry" out the door with me or have stick with me for a certain period of time-- he has taken my hand, said something really funny that is a joke between us, etc. Then he always says, "See you on (insert day of next appointment)."

You know how I feel about that timer your T has. I'm sorry, but that's just ridiculous. That %#@&#! would get thrown across the room if it was in my therapy.