In healthy adults, the half-life of caffeine is 4.9 hours. In pregnant women, the half- life is 9-11 hours. In infants as well as young kids, the half-life of caffeine is longer than the adults, about 30 hours. Patients with severe liver disease, caffeine may accumulate in the liver with the half-life up to about 96 hours.
Much of North Koreaâs aviation fuel appears to come from China. In 2015, the isolated country spent $877,048 importing 1,415 tonnes of Chinese jet fuel, according to Chinese customs data - enough for North Korea to operate its fleet of largely Soviet-era military aircraft.
It's quite possible North Korea has all the parts and expertise to build a nuclear-tipped ICBM that can reach the United States. However, there is only one launching pad for a Taepodong-2, and it would require hours of preparation before the missile is ready. We also don't know how reliable the rocket would be.