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According to the information provided, the recommended gap between doses of Advil (ibuprofen) depends on several factors, including the dosage, the individual's age, and the condition being treated. However, generally, it is recommended to wait at least 4 to 6 hours between doses of ibuprofen [1].

For adults and children 12 years and older, the maximum dosage of ibuprofen is 3200 mg in 24 hours [2]. It is important to note that taking more than the recommended dose or taking doses too close together can increase the risk of side effects, such as stomach pain, ulcers, and kidney damage [3].

It is always recommended to consult with a healthcare professional or pharmacist for personalized dosage information and recommendations [4]. They can provide guidance based on the individual's medical history, current medications, and specific needs.

In summary, the recommended gap between Advil doses is typically 4 to 6 hours, but it is important to follow the dosage instructions provided by a healthcare professional and to not exceed the maximum daily dosage.

Sources:

* [1] <https://www.drugs.com/ibuprofen.html>
* [2] <https://www.mayoclinic.org/drugs-supplements/ibuprofen-oral-route/proper-use/drg-20068659>
* [3] <https://www.webmd.com/drug-safety/news/20161215/ibuprofen-and-heart-risks-what-you-need-to-know>
* [4] <https://www.drugpatentwatch.com/ibuprofen>