The sources provided do not provide information on how long after taking Lipitor one can snack. However, they do provide information on Lipitor (atorvastatin), its usage, and food interactions.

Lipitor is a prescription medication used to lower cholesterol levels and reduce the risk of heart attack and stroke [1]. It is a member of the statin class of drugs that work by blocking the enzyme responsible for producing cholesterol in the liver [3]. Lipitor is usually taken once a day, with or without food, at any time of the day [2].

According to Drugs.com, taking Lipitor with food does not affect its effectiveness [2]. However, it is recommended to avoid eating grapefruit or drinking grapefruit juice while taking Lipitor, as it can increase the level of the drug in the bloodstream and increase the risk of side effects [2].

The British Heart Foundation also advises avoiding consuming large amounts of alcohol while taking Lipitor, as it can increase the risk of liver damage [3].

In summary, the sources provided do not give information on how long after taking Lipitor one can snack. However, it is safe to take Lipitor with or without food, and it is recommended to avoid grapefruit and large amounts of alcohol while taking the medication. It is best to consult with a healthcare provider for any concerns or questions regarding Lipitor usage and food interactions.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.drugs.com/medical-answers/eat-food-taking-atorvastatin-3565628/
[3] https://www.bhf.org.uk/informationsupport/heart-matters-magazine/medical/drug-cabinet/statins