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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.
These discontinuation effects may persist long after caffeine has been fully cleared from your system. Most sources suggest that the average plasma half-life of caffeine in healthy adults is within the range of 3 to 5 hours. Though 50% of the drug may be cleared from your body within 5 hours, it will take ~1.15 days to fully eliminate caffeine from your system.