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Detox timeline calculators estimate how long a substance takes to clear from the body based on its biological half-life — the time for plasma concentration to halve. Full clearance is approximately 5 half-lives.

Trinn-for-trinn guide

1. 1Full clearance ≈ 5 × half-life
2. 2Caffeine: half-life 5–6 hours; fully cleared in ~30 hours
3. 3Nicotine: half-life ~2 hours (cotinine 16–20 hours)
4. 4Alcohol: metabolised at ~0.015% BAC/hr (15mg/100mL/hr) linearly — not exponential

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