How many sessions are recommended for melasma treatment?

After spending a lot of time outdoors, I noticed that the blemishes and age spots around both of my cheekbones have darkened and look patchy. It’s really stressing me out because they show through, not only when I’m barefaced but even when I cover them heavily with cushion foundation.

I am planning to visit a dermatologist to start proper melasma treatment before it gets darker. I see there are various treatment programs available, such as laser toning and blemish care; how many sessions are typically recommended to achieve a clean, faded look?

I obviously don't think one or two sessions will be enough. I'm wondering if consistent treatment of at least 5 or 10 sessions is usually necessary to see results. I'd like to hear the experiences of those who have completed the recommended number of melasma treatments!