My T has a clock on the bookshelf, I see her glance at it every once in a while but its OK. I've never been cut off in mid sentence. At this point, I haven't had any issues with the way sessions have ended. I will however admit that I frequently worry about how the session will end if I ever do get emotional. First I will be greatly mortified if I ever get emotional. Second, I would be very upset if I didn't have a chance to collect myself before leaving the room. Third, if I felt rushed out, I would not go back. The alarm clock WOULD NOT work for me. No now and certainly not if I ever got to a point where I actually experience my emotions. That is just WRONG!