I think it depends on the therapist. From what I have read, some are big into setting termination dates and then that is it, some wind down going from weekly to every other week to monthly until it winds down, and some are whatever works for the client. Many, as I understand it, tell the client that they are welcome to come back if something new comes up. I think this is where the conventional wisdom around here of talk to the therapist might come into play if it is causing you anxiety.