Research has recently proven that the 21 day guideline that has been around since 1960 underestimates the time needed to change. On average, it takes more than two months before a new behavior becomes automatic -- 66 days to be exact. And how long it takes a new habit to form can vary widely depending on the behavior, the person, and the circumstances. Before you mislead yourself (or a student) read about Lally's research at www.huffingtonpost.com
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