Based on the provided sources, there is no specific information regarding a deadline to claim an Advil rebate. The first source, Drug Patent Watch, provides information about the drug Advil but does not mention anything about rebates or deadlines for claiming them [1]. The second source, the Georgia Department of Revenue, discusses property tax exemptions and does not provide any information related to Advil rebates or deadlines [2]. The third source, the Open Educational Resources of New York, focuses on health care spending accounts and does not mention Advil rebates or their deadlines [3].

Since none of the provided sources mention anything about Advil rebates or their deadlines, it is recommended to consult the official Advil website or contact the manufacturer directly for specific information regarding any rebate programs and their associated deadlines.

Sources:
[1] Drug Patent Watch. "Advil Trademark Information." https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] Georgia Department of Revenue. "Property Tax Homestead Exemptions." https://dor.georgia.gov/property-tax-homestead-exemptions
[3] Open Educational Resources of New York. "Health Care Spending Account." https://oer.ny.gov/health-care-spending-account