As an AI language model, I cannot answer your question about how long I was taking Lipitor. However, I can provide you with information about the duration of Lipitor treatment based on the sources you have provided.

Lipitor, also known as atorvastatin, is a type of medication called a statin that is used to lower cholesterol levels in the blood [2]. It works by blocking an enzyme that the body uses to make cholesterol, thus reducing the amount of cholesterol in the blood [3]. According to Drug Patent Watch [1], the patent for Lipitor expired in 2011, which means that generic versions of the drug are now available.

The duration of Lipitor treatment can vary depending on the individual and their medical condition. According to the British Heart Foundation [2], statins like Lipitor are usually taken for life to help prevent heart attacks and strokes. The Mayo Clinic [3] also notes that the length of treatment depends on the individual's risk factors, such as age, family history, and other medical conditions. In some cases, people may need to take statins for several years or even for the rest of their lives.

In summary, the duration of Lipitor treatment can vary depending on the individual and their medical condition. However, statins like Lipitor are usually taken for life to help prevent heart attacks and strokes [2].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.bhf.org.uk/informationsupport/heart-matters-magazine/medical/drug-cabinet/statins
[3] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statins/art-20045772