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The time it takes for Lipitor (atorvastatin) to show its benefits can vary among individuals. Typically, patients may start to see improvements in their cholesterol levels within 2 weeks of starting treatment. However, it may take up to 4 weeks for some people to notice significant changes. It is essential to continue taking Lipitor as prescribed by your healthcare provider, even if you do not immediately see results, as the full benefits may take several weeks to become evident. It is important to follow your doctor's instructions and have regular check-ups to monitor your progress and adjust your treatment plan if necessary. [2][3]

Sources:
[2] https://www.nhs.uk/medicines/atorvastatin/common-questions-about-atorvastatin/
[3] https://www.drugs.com/tips/lipitor-patient-tips