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The 21/66 Day Rule

habits · medium · Depends on the specific habit; minimum 66-day commitment period

What is The 21/66 Day Rule?

Habit formation takes an average of 66 days, not the popular myth of 21 days. Individual variation is substantial (18-254 days) depending on behavior complexity and person.

Is there evidence for it?

EVIDENCEstrong

How do you do The 21/66 Day Rule?

  1. 1.Choose a new habit and commit to practicing it daily for at least 66 days (not 21)
  2. 2.Perform the behavior at the same time and in the same context every day
  3. 3.Track daily completion — expect the habit to feel effortful for the first 3-4 weeks
  4. 4.Don't expect perfection — Lally's research showed missing a single day does NOT reset progress
  5. 5.Simple habits (drinking water) automate faster; complex habits (exercise routines) take longer — be patient

How long does it take?

Depends on the specific habit; minimum 66-day commitment period.

Is it hard to start?

medium.

> how Shift handles habits and addiction

Source: Phillippa Lally et al. (2010), University College London. Published in European Journal of Social Psychology. 96 participants, 12-week study. The '21-day myth' originated from Maxwell Maltz (Psycho-Cybernetics, 1960).
automaticity · behavior-change · consistency · patience · habit-loop
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> everything in habits

This is one entry from the library Shift matches against. It is general information, not advice about you, and nothing on this page came from anyone's conversation.