According to Lipitor's prescribing information, it typically takes 2-4 weeks for Lipitor to lower cholesterol levels [1]. However, it's important to note that the timeframe may vary depending on the individual's response to the medication and the severity of their high cholesterol.

It's also worth mentioning that Lipitor is a statin, a class of drugs that work by blocking the production of cholesterol in the body [2]. These medications are often used in conjunction with lifestyle changes, such as a healthy diet and regular exercise, to manage high cholesterol levels.

According to DrugPatentWatch.com, Lipitor's patent expired in 2011, which has led to the availability of generic versions of the drug [3]. This has increased accessibility and affordability of the medication for patients.

In summary, Lipitor typically takes 2-4 weeks to lower cholesterol levels, but the timeframe may vary depending on the individual. It's important to continue taking the medication as directed by a healthcare provider and to make lifestyle changes to manage high cholesterol.

Sources:
[1] "Lipitor (atorvastatin) tablets, for oral use." U.S. Food and Drug Administration. <https://www.accessdata.fda.gov/drugsatfda_docs/label/2016/020990s051,021152s015lbl.pdf>.
[2] "Statins: MedlinePlus." MedlinePlus. <https://medlineplus.gov/statins.html>.
[3] "Atorvastatin Calcium (Lipitor) Drug Patent Expiration and Generic Launch Dates." DrugPatentWatch.com. <https://www.drugpatentwatch.com/drugs/atorvastatin-calcium>.