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the half life of the amount of caffeine in a normal severing (8oz) of coffee is 5 hours, meaning that the effects of the coffee will last 5 hours... Well caffiene does honestly depend on how reactive you are to stimulants, I am in concerta 27mg and I accidentally ate some chocolate today a Swiss roll specifically.
Medical conditions, age can also be a part in altering the half life of caffeine. The remaining amount of caffeine in your body can stay up to 8-14 hours, depending on the dose and intake amount. The amount of caffeine taken in plays a big factor in keeping your body free of most of the side effects.