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Habit Formation Without the 21-Day Myth
A practical habit formation guide based on stable context, repetition, small recovery versions and honest expectations about timing.
Summary
Choose a stable cue, repeat a small behavior, record evidence and recover quickly after misses.
Principle 2
In the cited 12-week study, fitted time to 95% of the automaticity plateau varied from 18 to 254 days.
Principle 3
General education, not health advice. Reviewed 27 August 2026.