According to the sources provided, Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood [1][3]. Lipitor withdrawal symptoms can occur after discontinuing the medication, but the time frame for the onset of symptoms is not specified in the sources [2][3].

Withdrawal symptoms from Lipitor can include muscle pain, weakness, and tenderness [2]. These symptoms may occur due to the body's reaction to the sudden absence of the medication [2]. The severity of withdrawal symptoms can vary from person to person and can last for several weeks [2].

It is recommended that patients do not stop taking Lipitor without consulting their doctor [2][3]. The doctor may advise the patient to gradually reduce the dosage of the medication to minimize the risk of withdrawal symptoms [2].

In conclusion, the sources provided do not specify how quickly Lipitor withdrawal symptoms can occur. However, it is recommended that patients do not stop taking Lipitor without consulting their doctor to minimize the risk of withdrawal symptoms [2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.mymed.com/medication/atorvastatin-lipitor/discontinuation-and-withdrawal-of-atorvastatin-lipitor
[3] https://www.nhs.uk/medicines/atorvastatin/common-questions-about-atorvastatin/