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.
Each person is different and for me it takes less than 15 min's for ibuprofen to work in MY body but I know that ibuprofen has a half life of 2 hours, so it will be working it's best in 2 hours but you should feel it working in 30 min's to 1 hour.