Lipitor is a commonly prescribed medication used to lower cholesterol levels in the blood. It is known to cause elevated liver enzymes in some patients. The duration of this elevation can vary depending on several factors, including the patient's age, sex, and overall health.

According to the drug patent watch [1], the FDA has reported that liver enzyme elevations occur in less than 1% of patients taking Lipitor. However, the incidence of this side effect increases with higher doses of the medication.

A study published in the National Center for Biotechnology Information [2] found that the duration of elevated liver enzymes in patients taking Lipitor varied from a few weeks to several months. The study also found that older patients and those with pre-existing liver disease were more likely to experience this side effect.

The American Academy of Family Physicians [3] notes that liver enzyme elevations typically return to normal levels within four to six weeks after discontinuing Lipitor. However, in some cases, it may take longer for liver function to fully recover.

In conclusion, the duration of elevated liver enzymes in patients taking Lipitor can vary from a few weeks to several months, depending on the patient's age, sex, and overall health. Patients who experience this side effect should consult with their healthcare provider, who may recommend reducing the dose or discontinuing the medication. It is important to monitor liver function regularly while taking Lipitor.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3070374/
[3] https://www.aafp.org/pubs/afp/issues/2005/0115/p380.html