Based on the information available, I could not find a specific recommendation on how often you can take Lipitor with grapefruit juice. However, it is worth noting that consuming grapefruit juice while taking Lipitor (atorvastatin) is generally not recommended [1]. This is because grapefruit juice can increase the levels of atorvastatin in your blood, which may increase the risk of side effects [1][2].

According to DrugPatentWatch.com, Lipitor is a medication used to treat high cholesterol levels [3]. It works by reducing the production of cholesterol in the body [3]. Grapefruit juice can interfere with the enzymes in the intestines that are responsible for breaking down Lipitor, leading to increased levels of the drug in the bloodstream [1].

While the occasional consumption of grapefruit juice may not cause significant harm, regular and excessive intake of grapefruit juice should be avoided while taking Lipitor [1]. If you have any concerns about consuming grapefruit juice while taking Lipitor, it is best to consult with your healthcare provider [2].

In summary, while there is no specific information on how often you can take Lipitor with grapefruit juice, it is generally advised to avoid or limit the consumption of grapefruit juice while taking Lipitor [1][2]. If you have any concerns, consult with your healthcare provider.

Sources:
[1] <https://www.ncbi.nlm.nih.gov/books/NBK507345/>
[2] <https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/expert-answers/grapefruit-juice-and-drugs/faq-20057819>
[3] <https://www.drugpatentwatch.com/drugs/lipitor>