Advil is a brand name for ibuprofen, which is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain, reduce fever, and decrease inflammation [1]. The onset of action for Advil depends on the form of medication and the individual's response to the drug.

According to GoodRx [2], the onset of action for Advil varies between 20 to 30 minutes when taken orally. However, the effects of Advil may last for up to six hours. The time it takes for Advil to work depends on various factors, including the severity of the pain or inflammation, the individual's age, weight, and overall health.

Healthline [3] states that the effects of Advil may take longer to be felt when taken with food. It is recommended to take Advil with food or milk to avoid stomach irritation. Additionally, the duration of action for Advil may be prolonged in older adults, those with kidney or liver problems, and those taking other medications that interact with ibuprofen.

In conclusion, Advil typically takes 20 to 30 minutes to work when taken orally, but the onset of action may vary depending on individual factors. It is important to follow the recommended dosage and take Advil with food or milk to avoid stomach irritation. If pain or inflammation persists, it is recommended to consult a healthcare provider.

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