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Evidence-first writing on focus, attention and high-stakes work from the LockIn team. No hype, every claim sourced.

· 3 min read

Caffeine Half-Life: How Long It Stays in Your Body and When to Stop

Caffeine half-life is about 5 hours but ranges from 1.5 to 9.5. See how long caffeine stays in your system and how to set your own cut-off time.

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