There are people that go on month and two month long juice cleanse journeys. Ask our mate Joe Cross. Despite contrary opinion, fibre is not oxygen. That being said, it's all up to the individual and their familiarity with liquid nutrition. If you have eaten meat everyday since pre-school then start with one or two days. Those with a plant based diet should aim for 3-5 day detoxes and anyone that masters a few of those can contact us about booking a cleanse beyond five days.