How long does Caffeine effect the brain for? Im only a cup of coffee or a can of coke?!

Question: How long does Caffeine effect the brain for!? Im only a cup of coffee or a can of coke!?
Answers:

i read somewhere that caffeine loses 25% of its effectiveness every 6hrs, saying that it takes 24hrs for it to be completely depleted from your body

but i have a hard time believing itWww@FoodAQ@Com

don't know- but I am a true "buckie"!. I go to Starbucks daily and get a latte with 4 shots of espresso!. Sometimes I have as many as 12 shots in a day!. Used to drink a 12-pack of Pepsi everyday!. Cut down a little cause it was affecting my sleep!.Www@FoodAQ@Com

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How long does Caffeine effect the brain for? Im only a cup of coffee or a can of coke?!

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