Based on the provided information, there is no explicit time frame given for receiving Lipitor rebates. However, the official Lipitor website (https://www.lipitor.com/en/savings) does provide a Lipitor co-pay card that can help eligible patients save on their prescription. The process for obtaining this savings is outlined on the website, but specific details about the duration of the rebate process are not provided.

It is recommended to contact Lipitor's customer service or the insurance provider directly for the most accurate and up-to-date information regarding the rebate process and its duration.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.lipitor.com/en/savings
[3] https://www.justice.gov/archive/opa/pr/2002/October/02_civ_622.htm