Advil is a brand name for the drug ibuprofen [1]. Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) that is commonly used to relieve pain and reduce inflammation. According to GoodRx, ibuprofen typically takes about 20-30 minutes to start working after it is taken orally [2]. However, the full effect of the medication may not be felt for up to 2 hours after taking it. Healthline also states that ibuprofen can take up to 2 hours to reach its full effect [3]. It is important to note that the time it takes for Advil to relieve pain may vary depending on factors such as the individual's metabolism, the severity of the pain, and the dosage of the medication. It is recommended to always follow the dosage instructions provided by a healthcare professional or on the label of the medication.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[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