Answer: You shouldn't take more than the highest recommended dose for more than 10 days. Do not take it with any other NSAIDs. In any event if you feel faint, have bloody or black stools, or you are vomiting blood, go to the hospital because you are experiencing stomach bleeding.
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If you are an otherwise well adult on no other medications you can take 400mg (usually 2 tablets) a maximum of three times a day. If you take 2 tablets then you should wait at least 4 hours before taking any more.
A little more...FDA at this time (2013) indicates that the maximum recommended OTC dosage of ibuprofen is 1200mg per day. The max recommended prescribed dosage is 3200mg/day for up to 10 days.
Doses over the OTC limit should be under a doctor's care.
Usually 2 advil or 400 miligrams ibuprofen one begins to feel the effects 30-45 minutes after taken.