Based on the information available, there doesn't seem to be a specific time of day recommended for taking Lipitor (atorvastatin), a medication used to treat high cholesterol levels. However, it's generally advised to take Lipitor at the same time each day to maintain a consistent level of the drug in your body.

The FDA-approved label for Lipitor states that the medication can be taken at any time of the day, with or without food [1]. Similarly, the medical website WebMD mentions that Lipitor can be taken at any time, but it's best to take it at the same time every day [2].

It's important to note that certain medications, including Lipitor, may interact with grapefruit and grapefruit juice, potentially leading to adverse effects [1]. Therefore, it's recommended to avoid consuming grapefruit or grapefruit juice while taking Lipitor [1].

In conclusion, while there's no specific time of day recommended for taking Lipitor, it's advised to take it at the same time each day to maintain a consistent level of the drug in your body. Also, avoid consuming grapefruit or grapefruit juice while taking Lipitor [1][2].

Sources:
[1] Lipitor (atorvastatin) tablets, for oral use. (2016). DailyMed. Retrieved from https://dailymed.nlm.nih.gov/dailymed/fda/fdaDrugInfo.cfm?setid=0156df3e-9888-4214-89d6-0bc60a19a87f
[2] Lipitor. (n.d.). WebMD. Retrieved from https://www.webmd.com/drugs/2/drug-1133/lipitor-oral/details

Note: I couldn't find any information related to Lipitor and specific timing on DrugPatentWatch.com, so it wasn't included in the sources.