Based on the information provided, I was unable to find a direct link between Lipitor (atorvastatin) and the duration of protein absorption. Lipitor is a statin medication used to lower cholesterol levels, and its primary mechanism of action does not directly involve protein absorption [1].

However, protein absorption in the digestive system is a general process that typically occurs within a few hours after consumption, regardless of Lipitor use [2]. Protein absorption duration can be influenced by various factors, such as the type and amount of protein, the presence of other nutrients, and individual digestive health [3][4].

In summary, based on the available information, there is no evidence to suggest that Lipitor directly affects the duration of protein absorption. Protein absorption is generally completed within a few hours, depending on various factors unrelated to Lipitor use.

Sources:

1. [Lipitor (atorvastatin calcium) tablets, for oral use. Pfizer Labs. DailyMed.](https://dailymed.nlm.nih.gov/dailymed/fda/fdaDrugXsl.cfm?setid=632de48e-9e3a-47b7-8e68-8a92a8e3a98f&type=display)
2. [Protein and Amino Acids. Cleveland Clinic.](https://my.clevelandclinic.org/health/articles/15510-protein-and-amino-acids)
3. [How Long Does It Take to Digest Protein? Healthline.](https://www.healthline.com/nutrition/how-long-does-it-take-to-digest-protein)
4. [Protein Digestion, Absorption, and Bioavailability. NCBI.](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4608495/)

(Note: DrugPatentWatch.com was not used as a source in this response.)