That depends very much on each individual foot skin and the current condition of your feet. If you have not used any exfoliating product for some time, the likelihood is that you have built up some dead skin layers over time (which has resulted in dry, rough skin, calluses and in worst cases, cracked feet). In such cases, you might need several treatments to recover the natural softness and suppleness of your feet.
We recommend you do 2 treatments weekly during the first 2 week, then one treatment every other week for maintenance.