As a patient going through this form of thereapy, I can give my personal experience to help with that answer. I started giving it a try back at the begining of summer 2017. With is being Mid November, I will have been going to these sessions for over 3 months now. The improvement within my disorder has been making changes day by day and on session at a time. As far as the meaningful changes within 50 percent of patients, they range from as far as 3 to 6 months. Some people continue on with the therapy for years to come.