BOILING WATER for 15 to 20 minutes kills 99.9% of all living things and vaporizes most chemicals. Minerals, metals, solids and the contamination from the cooking container become more concentrated.
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Well its stays in your body for about 7 to 8 hours but it takes effect right away. if you drink a cup of coffee it is speeding through your body before you are done with the first cup. But it starts to dissipate after couple hours but does not wear off completely for hours.