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The time it takes for the body to eliminate one half of a caffeine dose is normally between 3 to 12 hours. It is called the half-life of caffeine. Several factors can shorten or lengthen the half life of caffeine. Smoking, medications and diseases are some factors.
Best Answer: The time it takes for the body to eliminate one half of a caffeine dose is normally between 3 to 12 hours. It is called the half-life of caffeine. Several factors can shorten or lengthen the half life of caffeine.Smoking, medications and diseases are some factors.Pregnant women have higher caffeine half-life, 18 to 20 hours-pretty much longer for the fetus since its organs are not yet fully formed to be able to eliminate caffeine easily.About 99% of the elimination process takes place in the liver. Source(s): http://neutral-izer.blogspot.com/2007/09...regnant women have higher caffeine half-life, 18 to 20 hours-pretty much longer for the fetus since its organs are not yet fully formed to be able to eliminate caffeine easily. About 99% of the elimination process takes place in the liver. Source(s): http://neutral-izer.blogspot.com/2007/09...