As an AI language model, I have never taken Lipitor or any other medication. However, I can provide information on how long a person should continue taking Lipitor. According to UnityPoint Health [2], people who take statins like Lipitor should not stop taking them without consulting their doctor. Statins are used to lower cholesterol levels and reduce the risk of heart attack and stroke. Stopping statins abruptly can increase the risk of heart attack and stroke.

Furthermore, the duration of taking Lipitor depends on the individual's health condition and their doctor's recommendation. According to Drug Patent Watch [1], the patent for Lipitor expired in 2011, and since then, generic versions of the drug have become available. The duration of taking Lipitor or its generic version is determined by the prescribing physician based on the patient's medical history, cholesterol levels, and overall health.

In a study published in CNN [3], researchers found that some patients who took statins for five years had a lower risk of heart disease and stroke. The study also found that the benefits of taking statins continued even after patients stopped taking the medication. However, the study does not recommend stopping statins without consulting a doctor.

In conclusion, the duration of taking Lipitor or any other statin depends on the individual's health condition and their doctor's recommendation. Patients should not stop taking statins abruptly without consulting their doctor as it can increase the risk of heart attack and stroke.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.unitypoint.org/news-and-articles/can-you-stop-taking-statins-once-you-start
[3] https://www.cnn.com/2017/07/24/health/statins-side-effects-outcomes-study/index.html