In Norway the oil and gas sector produces 23% of GDP. In the UK the financial services sector produces 10% of GDP. In Canada, a sector like Professional, scientific and technical services produces 5% of GDP.
ibuprofen will exit your system in 12-24 hours, depending on your body. the dosage doesn't effect time in your system, it just effects the potency of the drug during its duration i your body. so it may only take 12 hours to get out of your body, and the 600mg is just telling you how strong it will be in your body.
Depending on what painkiller, and why. If it's another NSAID, you should wait around 4 to 6 hours unless the dose of ibuprofen was low e.g. 200 mg. As for ibuprofen, if the pain didn't lessen after taking a dose of ibuprofen, if no stomach ache I would prefer one taking more ibuprofen up to maximum of 800 mg in total.