50 minutes, though occasionally I leave closer to 45 or lose track of time and it's 55 or so minutes. I usually wrap up the sessions. A few times he's invited me to stay for longer and once he asked if I wanted to come back later in the week. Other times he's reminded me that I can call or email and he will try to fit me in later that week if I want to. Sometimes I have called and usually I can get in for another session that week.