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Caffeine has, what we call, a half-life of about 5-6 hours in the average adult. In other words, after 5-6 hours, 50% of that caffeine is still going to be in your system. And what that means is that caffeine will then have a quarter-life of about 10-12
hours.
Matthew Walker
Caffeine's Half-Life Is 5-6 Hours; Its Quarter-Life Is 10-12 Hours
#10: Sleep & Caffeine Part 1
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