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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.
The half-life of caffeine, which refers to the time needed to eliminate half amount of caffeine out of the body, depends on many other factors such as age, body condition, liver function, etc. In healthy adults, the half-life of caffeine is 4.9 hours.