Judge a habit at day 66, not day 7

Missing one day didn't change the curve. Quitting does.

SWe reviewed the research on it.Habits and systems

How to use it

Habits become automatic on a curve that flattens slowly: a median of about 66 days, anywhere from 18 to 254. Missing one day didn't change the outcome. Morning habits, and habits you chose yourself, formed more strongly.

How sure we are

S Evidence: strong. Large trials or many studies, pointing the same way.

Sources

Lally et al. 2010 · Singh et al. 2024 (meta-analysis).

Not medical, legal or financial advice.

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