Nudge · 2-minute read
Habits take much longer to form than the “21 days” myth suggests — and missing one day barely matters. What kills a habit is the dramatic restart afterwards.
Participants repeating a daily behaviour took a median of 66 days to reach automaticity, with a huge range from 18 to 254 days. A single missed day had almost no lasting effect.
The danger is the story people tell after a miss: “we broke it”, followed by a fresh relaunch. Each relaunch signals that the practice is optional. Quietly carrying on is what turns a ritual into a habit.
The research: Lally, van Jaarsveld, Potts & Wardle (2010), European Journal of Social Psychology.
Adapted from Nudges at Work by Tareef Jafferi, shared in partnership with Happily.ai.
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