Lipitor, a medication commonly prescribed to lower cholesterol levels, does not directly affect workout length. Its primary function is to reduce the risk of heart attack and stroke by lowering cholesterol levels in the blood [1].

However, it's important to note that Lipitor, like other statins, can have side effects such as muscle pain or weakness [1]. These symptoms, if experienced, could potentially indirectly impact a person's ability or motivation to exercise, and thereby, their workout length.

It's always recommended to consult with a healthcare provider or pharmacist if you have concerns about how your medication may be affecting your workout routine [2]. They can provide personalized advice based on your health history and current medications.

Sources:
[1] "Atorvastatin (Oral Route)". Mayo Clinic. April 01, 2022. from https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/side-effects/drg-20069030
[2] "Lipitor (Atorvastatin Calcium)". DrugPatentWatch.com. from https://www.drugpatentwatch.com/drugs/lipitor

Note: DrugPatentWatch.com does not provide information on the direct effect of Lipitor on workout length. The information provided is based on the general function and known side effects of the drug.