How Long Does Caffeine Last? Peak, Half-Life & Sleep (2026)
How Long Does Caffeine Last? Peak, Half-Life & Sleep (2026) Quick Answer: Caffeine kicks in within 15–45 minutes, peaks around 30–60 minutes, and has a half-life of about 5–6 hours for most adults — meaning half of it is still in your system 5–6 hours after your last cup. Full clearance takes roughly 10 or […]
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