According to the sources provided, there is no specific timeframe for when it is safe to take Advil (ibuprofen) after taking antibiotics. However, it is generally recommended to wait at least a few hours after taking antibiotics before taking Advil or any other nonsteroidal anti-inflammatory drugs (NSAIDs) like aspirin or naproxen. This is because NSAIDs can interfere with the effectiveness of antibiotics and may also cause stomach irritation or other side effects when taken together [3]. It is always best to consult with a healthcare provider or pharmacist for specific advice on drug interactions and timing [2]. It is also important to follow the instructions on the label and not exceed the recommended dose of Advil [1].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.advil.com/advil-safety/combining-medications/
[3] https://www.drugs.com/medical-answers/take-ibuprofen-antibiotics-3121711/