Bruce Keener’s Lifestream

Although the average was 66 days, there was marked variation in how long habits took to form, anywhere from 18 days up to 254 days in the habits examined in this study. As you'd imagine, drinking a daily glass of water became automatic very quickly but doing 50 sit-ups before breakfast required more dedication (above, dotted lines). The researchers also noted that:

• Missing a single day did not reduce the chance of forming a habit.
• A sub-group took much longer than the others to form their habits, perhaps suggesting some people are 'habit-resistant'.
• Other types of habits may well take much longer.

Interesting study refuting the old wives' tale that it takes 21 days to form a habit.