When can Cosmelan Mask 1 be repeated?

The areas where there is a lot of melasma didn't peel much. I want to redo the Cosmelan Mask 1 before winter ends, its been 8 weeks since first treatment and I am still doing Cosmelan 2. Does there need to be a break in between treatments as the skin might have become used to the product? Or, will my skin become too sensitive?