I do 90 minute emdr sessions with my VA T and my regular t and I have added 90 minutes sessions recently. I agree with the others - 50 minutes simply aren't enough. It takes me so long to calm down that by the time I'm able to talk the session is over.
I would love to be able to do 2 hour session - -though it would be exhausting.
Yes, I work quite intently with clients but obviously within the clients capabilities and safety zone, most clients are exhausted by the end of our sessions so I do wonder whether the personality and modality of the therapist influences it at all. I may try out some 90 minute sessions in my private practice and see how it goes.