How many sessions do I need to get the full effects of the acne treatment?

Hello, I am an office worker stressed out by adult acne. I consulted a dermatologist, and they recommended various laser treatments and skincare programs. However, I am concerned because I heard that the time it takes for acne treatments to show results varies from person to person. I am wondering if I can usually expect noticeable results after just one session, or if I need at least three sessions to feel my skin texture improving. Since I am busy, the time required for the procedures and pre- and post-treatment care is a problem for me.
I would also like to know the treatment cycle for seeing results. I am worried that I might just waste money without seeing any effect, so I would appreciate reviews or advice from those who have personally experienced it.