How long does the effect of Pico Toning last?

Now that summer is over, melasma and blemishes have suddenly appeared on my face, making my overall skin tone look dull. I've heard that Pico Toning is very effective for pigmentation, so I'm seriously considering buying a 10-session package. However, I've heard that with this type of toning, your skin quickly returns to its original state after treatment, so I'm worried about how long the effects actually last. Typically, how long does the toned skin effect last after completing a full course of Pico Toning? I know it depends on how you care for it, but I've seen reviews mentioning that melasma reappears quickly. I'd appreciate any advice on whether the effects last quite a while once seen, or if there are any tips for maintaining the results.