Advil, also known as ibuprofen, is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain and reduce fever. According to the sources provided, the duration of Advil in the body can vary depending on factors such as age, weight, and liver and kidney function.

The first source [1] provides information on the patent status of Advil but does not provide any information on how long it stays in the body.

The second source [2] states that the half-life of Advil is approximately 2 to 4 hours, meaning that half of the drug is eliminated from the body within that time frame. However, it also notes that the drug can remain in the body for up to 24 hours after ingestion, particularly in individuals with impaired liver or kidney function.

The third source [3] provides dosage information for Advil but does not mention how long the drug stays in the body.

In summary, while the half-life of Advil is approximately 2 to 4 hours, the drug can remain in the body for up to 24 hours, particularly in individuals with impaired liver or kidney function. It is important to follow the recommended dosage and consult with a healthcare provider if there are any concerns about Advil's effects on the body.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://mytexasmd.com/how-long-does-advil-last-in-the-body/
[3] https://www.singlecare.com/prescription/advil/dosage