ivermectin (soolantra, horse paste etc.) success. How long does it take and last?

Wondering for those of you got good results from ivermectin (soolantra, horse paste, rosiver etc.), 1. How long did you use the medication? 2. How long your skin stays clear after you stop using? (I have heard remission generally lasts 4 months to 1 year, for a few lucky ones, symptoms never came back) .