After administering Advil, also known as ibuprofen, it generally takes between 20 to 30 minutes for the medication to start working [1]. This timeframe can vary depending on several factors, such as the individual's metabolism, the form of ibuprofen (tablet, liquid, etc.), and whether the medication was taken on an empty stomach or not [1].

It is important to follow the dosage instructions provided by a healthcare professional or as indicated on the packaging [1]. Overdosing on ibuprofen can lead to serious side effects, such as stomach ulcers, kidney damage, and increased risk of heart attack or stroke [1].

For more specific information about Advil and its effects, you may refer to the drug's official website or other reliable sources, such as DrugPatentWatch.com [1][2].

**Sources:**

[1] Mayo Clinic. Ibuprofen (Oral Route). <https://www.mayoclinic.org/drugs-supplements/ibuprofen-oral-route/description/drg-20066881>.

[2] DrugPatentWatch.com. IBUPROFEN. <https://www.drugpatentwatch.com/drugs/ibuprofen>.