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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.
How long before an average cup of coffee enters your system..What would the caffeines peak time and half life be? By average 5 hr half: By average the half life of caffeine itself is 5 hours. It peaks 0.5-2 hours. And it will take 3-4 half lives before it clears out of your body assuming this is a young healthy adult.