66 Days To Form A New Habit

There are always some things you must do, to avoid paying an unacceptably high price-things such as bookkeeping for your business or exercising regularly to remain fit.The easiest way of getting things done is to make them habits.The common belief is that doing something continuously for 3 weeks to a month helps you learn a habit.Here is some research to give you a better idea of how to build habits:

Phillippa Lally and colleagues from University College London recruited 96 people who were interested in forming a new habit such as eating a piece of fruit with lunch or doing a 15 minute run each day Lally et al. (2009). Participants were then asked daily how automatic their chosen behaviours felt. These questions included things like whether the behaviour was ‘hard not to do’ and could be done ‘without thinking’.

When the researchers examined the different habits, many of the participants showed a curved relationship between practice and automaticity of the form depicted below (solid line). On average a plateau in automaticity was reached after 66 days. In other words it had become as much of a habit as it was ever going to become.

This graph shows that early practice was rewarded with greater increases in automaticity and gains tailed off as participants reached their maximum automaticity for that behaviour.

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.

What this study reveals is that when we want to develop a relatively simple habit like eating a piece of fruit each day or taking a 10 minute walk, it could take us over two months of daily repetitions before the behaviour becomes a habit. And, while this research suggests that skipping single days isn’t detrimental in the long-term, it’s those early repetitions that give us the greatest boost in automaticity. Unfortunately it seems there’s no such thing as small change: the much-repeated 21 days to form a habit is a considerable underestimation unless your only goal in life is drinking glasses of water.