I recommend twice a day, although I find that many of my clients prefer only once a day. In that case make it at night time. The reason for this is that is at night while you are at rest, your body is repairing, recharging, and getting ready for the new day. Therefore your clean skin and night cream have the ability to work their magic. If the grime and dirt that your skin attracts during the day is not washed off, your skin will suffer, and aging is accelerated.