Essentially, therapy ends when it feels right for you. Some treatments are quite structured and others are more open ended. Overall, the timing of the ending is a two way decision made by us together. However, to give you a guideline, for CBT you could expect around 12 - 25 sessions, depending on what brings you to therapy. For EMDR you could expect around 6 - 12 sessions. For psychodynamic work, where we are exploring your patterns in relating to others and the world, the number of sessions is more fluid. Group work is usually 6 to 8 weeks.
When you are ready. The ending of therapy is a beautiful process, it enables understanding of how we deal with loss, ending and completion and it also marks the beginning of your journey of growth without therapy.
I see it that therapy ends when you are ready to 'be your own therapist' and when you feel that you have grown as much as you need in this piece of work. I like to offer a staged down process, where the gaps in sessions increase towards the end of the work, so that you get the experience of a gentle tailing off. However, some people prefer to simply finish, without the tailoring off and this is also absolutely appropriate.
The timing of the ending is a collaborative decision between us. With more focussed models, like EMDR, the ending will be more clear and in some cases (such as with insurance) we may have a set number of sessions approved from the outset and a fixed ending date from the start of the work.