Its is preferable for oily and sensitive skin.2-3 drops is sufficient for foaming. 1min of gentle massaging in making an 8 montion would suffice.it has along lasting effect of around 6-8 hours.u will feel like a robot recharged.a small pack if used twice daily would easily last for around 30-40 days.over using is not recommended as it would make the skin dry or can result in rashes