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How Long Does it Take an Action to Become a Habit; 21, 28, or 66 Days?

neuronsHave you ever wondered this?  I know I have, and as an ADHDer it is especially hard, because often times you lose focus and are on to creating the next greatest thing a habit.  So you start a lot of great new approaches, but they never seem to stick.

Ann Graybiel of MIT’s McGovern Institute has shown through research that neurons change their firing patterns when habits are learned, and then change them again when unlearned. However, as soon as something kicks back in the habit, they are fired back up.  That is why it is so easy to pick back up negative addictions like smoking and drinking, but also why if you establish good habits but lose them, you can kick them back up much easier as well.

So how long does it take to establish habits?  While the well established rule on habits is 21-28 days, the UK Health Behaviore Research Centre recently came out with research that found it took 66 days to form a habit.   I would tend to agree with the latest research — if we can do something for 66 days straight, we can do it for a year, five, or thirty.  21 or 28 days seems to be just enough time to make it questionable, or make you confident but not be able to stick to it.

It is sad to learn that we keep the pathways forever when we think in terms of addictions, but it is also great to know that we keep these pathways forever if we have healthy habits like meditation and working out.  I don’t know what research is the ‘correct’ research, but I would argue 21 days to develop a bad habit, 66 to develop a good one to be on the safe side.

What has your experience been on the length of time it takes to develop both good and bad habits?

Creative Commons License photo credit: MikeBlogs

How Long Does it Take an Action to Become a Habit; 21, 28, or 66 Days?

Kathryn Goetzke

I own a company called the Mood-factory (, a company that creates products based on how sensory experiences effect moods. I also run a nonprofit for depressio, iFred (, we are working to change the brand of depression. And yes, I have ADHD, along with PTSD, major depressive disorder, and a host of other challenges, opportunities, and gifts.

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APA Reference
Goetzke, K. (2010). How Long Does it Take an Action to Become a Habit; 21, 28, or 66 Days?. Psych Central. Retrieved on July 11, 2020, from


Last updated: 30 May 2010
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