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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.
How long does it take for caffeine to wear off? Caffeine has a half-life of three to five hours in a person's system, so it remains in the body for eight to 14 hours, according to the American Academy of Sleep Medicine. The effects of caffeine in the blood system peak 30 to 60 minutes after intake.