What is the appropriate frequency for Pico Toning?

Are there any of you who get Pico Toning regularly? I have had it four times so far at intervals of about once a month. It seems to have a maintenance effect, but my freckles don't seem to have faded.

For those of you with sensitive skin, how often do you do Pico Toning? Of course, I know that once a week is best for brightening, but that's difficult for people like me with thin and sensitive skin... Actually, after getting the treatment, my skin is sensitive and breakouts appear for about a week, so I need time to calm down.

Considering the balance of effectiveness and stimulation, what would be an appropriate Pico Toning cycle? I would appreciate your advice!