Advil is a brand name for ibuprofen, which is a nonsteroidal anti-inflammatory drug (NSAID) used to treat pain, fever, and inflammation. According to GoodRx [2], ibuprofen usually takes around 30 minutes to start working, although it can take up to an hour to feel its full effects. However, the time it takes for Advil to take effect can vary depending on several factors, including the individual's metabolism, the severity of the pain, and whether the medication is taken with food or on an empty stomach. Healthline [3] notes that taking Advil with food can help reduce the risk of stomach upset and improve absorption. It is important to follow the recommended dosage and not exceed the maximum daily dose of 1200 mg for over-the-counter ibuprofen products like Advil. Additionally, it is important to note that ibuprofen should not be taken for more than ten consecutive days unless directed by a healthcare provider.

Sources:
[2] https://www.goodrx.com/ibuprofen/how-long-does-ibuprofen-take-to-work
[3] https://www.healthline.com/health/how-long-does-ibuprofen-take-to-work