There is no specific time interval between taking Tylenol (acetaminophen) and Advil (ibuprofen). Both medications can be taken together, but it is important to follow the recommended dosages for each and not exceed the maximum daily dose for either medication. It is advisable to consult with a healthcare professional or pharmacist before combining these medications, especially if you have any preexisting medical conditions or are taking other medications. It is also important to be aware of potential side effects and interactions that may occur when taking these medications together [2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/TYLENOL
[2] https://www.drugs.com/medical-answers/safe-ibuprofen-with-acetaminophen-2991821/
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3374685/