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A member asked:
How long will black coffee keep me alert?
3 doctors weighed in across 2 answers
Depends: Caffeine content in coffee can vary from brand to brand or pot to pot, therefor it is impossible to predict how long one will stay alert from a cup of black coffee.
Answered 3/25/2014
4.3k views
Likely several hours: An average cup of coffee would probably keep you going for a few hours. If you drink more coffee all at once, it wouldn't keep you awake longer but would rather stimulate you more, perhaps uncomfortably so, for the same duration.
Answered 1/8/2016
1.7k views
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