How long does it take to cleanse the liver ?

No clear answer: It is unclear what you mean by "cleansing the liver" - the liver receives blood from the intestines and from the heart and is responsible for many functions, including excreting toxins. In some cases, the liver may be affected by long-term exposure to excess calories or toxins. If the damage is minimal, it can be reversed within a few weeks, in severe cases damage may not be reversible.