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the claim

It takes 21 days to form a habit.

the verdict
REFUTED
the evidence says no
Recorded sources
3 sources for · 1 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that it takes 21 days to form a habit?

No. A skeptical analysis directly addresses the 21-day rule, calling it pseudo-scientific and citing a study where reaching automaticity took 18 to 254 days. Several self-help and popular books merely repeat the 21-day figure as an unsourced saying.

Verdict: REFUTED · 3 sources for, 1 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 3
Little black book for graduates
2003
Get citation
Blaine, B. (2003). Little black book for graduates. archive.org. https://archive.org/details/littleblackbookf0000bart

Evidence against · 1
Does it take 21 days to form a habit?
2012
Get citation
Does it take 21 days to form a habit?. (2012). skeptics.stackexchange.com. https://skeptics.stackexchange.com/questions/7985/does-it-take-21-days-to-form-a-habit

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More for · 2
So you want to be a model? : find out what the agents and scouts are really looking for
2002
Get citation
1982-, S. J. (2002). So you want to be a model? : find out what the agents and scouts are really looking for. archive.org. https://archive.org/details/soyouwanttobemod0000sale

Virgin Vaping: Get Started with Electronic Cigarettes, e-Cigarettes, and Personal Vaporizers
2014
Get citation
Egger, C. (2014). Virgin Vaping: Get Started with Electronic Cigarettes, e-Cigarettes, and Personal Vaporizers. archive.org. https://archive.org/details/virginvapinggets0000cris

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