How many melasma treatment sessions do I need to see a change?

As blemishes are starting to appear one by one on my face, I am concerned because my skin doesn't look as clear as it used to, even with makeup on. I have heard that melasma is particularly difficult to manage, so I want to do thorough research before starting. For those who have actually received melasma treatment, what changes did you experience compared to when you first started? I am curious whether you felt noticeable effects after just one or two sessions, or if consistent treatment is necessary for the spots to fade gradually. I would also like to know if the effectiveness of melasma treatment varies depending on the laser used or your skin condition. Now that I am actually about to start, the price is also a concern. Rather than just checking the price per session, how much should I budget if I consider the total number of sessions required? I am also curious if the cost of the treatment ended up being higher than expected. It would be very helpful for me to make a plan if those who have experienced it firsthand could share the effects they felt and the actual costs they incurred.