I am really sorry your therapist retraumatized you. That is terrible, exactly the opposite of what they should be doing. Perhaps they need to be doing their own work before trying to "help" others.

My therapist has been open ended with it, and has not set a time limit. She usually inquires at the end of each session if I would like to make another appointment, and doesn't push that either. She is moving out of the clinic to start her own, and asked me at our last session if I would like to stay with the clinic or with her. The only thing she did say that sort of set a potential time limit was that if my psychiatrist decided my only issue was OCD when I followed up with him, that she would refer me to an OCD specialist. For awhile OCD stuff was all I talked about, and she said I deserved to feel better. I think she felt she wasn't helping enough. In a way I think that made me realize I needed to bring up other stuff we could work on, so that kind of fueled me to talk about more at our last session. However, I didn't feel pressured much, just that if I wanted her help I would have to tell her what she could help me with. This was only after seeing her for over a year. After bringing up more at our last session, she did not talk about referring me again (I will still be seeing an OCD specialist soon, though, but not instead). I hope if and when you look for a therapist you find a great one that can help you with the trauma.