How much coffee do you need to stay alert all day - and how much is too much?
Briefly

The average American drinks about 200 milligrams of caffeine a day, according to a 2017 study, which falls within the government and health group recommendations.
About 100 to 150 milligrams, which is equivalent to one to 1½ cups of coffee, is a rough estimate of how much caffeine is needed to give a healthy energy boost - though it depends on the individual, Astrid Nehlig, an emeritus research director at the French National Institute of Health and Medical Research, told the Wall Street Journal.
Read at New York Post
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