Probably one to two hours, depending on the level of service and the treatment. There are all kinds of pedicures and manicures. (Example here) Depending on soak time and different treatments (like foot masques and scrubs). There are quickie pedicures. Soak, buff, file, moisturize, polish. Then there are the elaborate "spa" pedicures. Soak, scrubs, masques, parafin treatments, etc.