How long does the effect of laser toning for melasma treatment last?

Is it because it's summer? I am in my 30s and deeply concerned about the dark spots that have recently appeared around my eyes and cheekbones. Since they don't cover well even with makeup, I am looking into getting toning or laser treatments at a dermatology clinic. While the cost is a concern, I am not convinced that the treatment will actually be effective enough to meet my expectations.

When I search online, I find that the time it takes to see results from melasma treatment and levels of satisfaction vary from person to person. I am curious how many treatment sessions are typically required to experience noticeable effects. Also, I’ve heard that even after diligently receiving treatment and achieving clear skin, melasma can quickly recur if care is neglected even slightly. Do you have any helpful home care tips to maintain the treatment's effects for a long time? Sharing your experiences and advice would be a great help in making my decision. I look forward to your reply.