Lipitor is a medication used to lower cholesterol levels in the body. Gradual adjustment of Lipitor is necessary to prevent adverse effects. According to the sources provided, the length of time for gradual Lipitor adjustment may vary depending on the individual's condition and response to the medication.

The drug patent watch [1] states that the recommended starting dose of Lipitor is 10 mg once a day, and the maximum dose is 80 mg per day. The dose can be increased every two to four weeks until the desired effect is achieved. The dose adjustment should not exceed 20 mg per day.

The National Center for Biotechnology Information [2] also recommends starting with a low dose of Lipitor and gradually increasing it. The adjustment period should be at least four weeks to monitor the patient's response to the medication. The dose should be increased in increments of 5 to 10 mg until the target LDL cholesterol level is achieved.

According to UpToDate [3], the gradual adjustment of Lipitor should be done over four to six weeks. The initial dose should be 10 to 20 mg per day, and the dose can be increased by 5 to 10 mg every two to four weeks. The maximum dose of Lipitor is 80 mg per day.

In conclusion, the length of time for gradual Lipitor adjustment may vary depending on the individual's condition and response to the medication. The recommended adjustment period is four to six weeks, and the dose should be increased gradually in increments of 5 to 10 mg until the target LDL cholesterol level is achieved. It is important to follow the instructions of a healthcare provider when taking Lipitor to ensure safe and effective treatment.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/books/NBK548236/
[3] https://www.uptodate.com/contents/image?imageKey=GAST/90194