The average therapy course is three to four months

https://www.psychologytoday.com/us/blog/the-right-mindset/202005/10-common-myths-about-therapy

While convenient for the novel or television show to have a character “fixed” in a session or two, it doesn’t work that way in real life. The average session is around 50 to 60 minutes and the first session is basically an intake and getting acquainted session. To get to the heart of a problem, psychotherapy takes many more sessions over time. On the flip side, as in “The Sopranos,” psychotherapy rarely takes six or seven years. Generally speaking, something’s not working when a client works with the same therapist for excessively long periods of time. The average therapy course is three to four months.