How many hours between advil?

How many hours between taking Advil (ibuprofen) depends on the strength of the dose and whether you’re using it for adults or children.

What’s the usual interval for adults?
For typical adult over-the-counter Advil (ibuprofen) dosing, the interval is commonly every 4 to 6 hours as needed. Do not exceed the maximum daily amount on the package (this is the key limit). [1]

What about children—what interval is used?
For children, dosing is weight-based, and the interval is also usually every 6 to 8 hours depending on the specific product and age/weight guidance on the label. [2]

If you meant “between different doses,” are you asking about mixing forms?
If you’re switching between ibuprofen and another pain reliever (like acetaminophen/Tylenol) or between immediate-release and extended-release products, the spacing rules can change—especially for extended-release formulations.

To give the exact number of hours, tell me:
1) Is it Advil for adults or children (and the child’s age/weight if for a child)?
2) What strength is the pill (e.g., 200 mg, 400 mg) or is it liquid?
3) Is it regular (immediate-release) or Advil Liqui-Gels/extended-release?

Sources:
[1] https://www.advil.com/faqs
[2] https://www.advil.com/children/faq