Paper2010
How Are Habits Formed: Modelling Habit Formation in the Real World
Phillippa Lally, Cornelia H. M. van Jaarsveld, Henry W. W. Potts & Jane Wardle
Tracking people forming a new daily habit, finds automaticity levelled off after a median of 66 days, not the widely repeated figure of 21, and that missing a single day did not materially harm the habit's formation.
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