Is the 21-Day rule a myth?
- Habitsky
- Apr 4, 2023
- 1 min read
The 21-Day rule is a generally accepted time frame for forming a good habit. Is it a myth or do we need more?

Why does everyone suggest the 21-day rule?
Originally, Maxwell Maltz, plastic surgeon, mentioned the 21-day time period in his book called Psycho-Cybernetics. In this book, Maxwell Maltz wrote about a scientific observation after a surgical operation. This concept has shaped the self-help industry since the 60's. Here is the original quote:
These, and many other commonly observed phenomena tend to show that it requires a minimum of about 21 days for an old mental image to dissolve and a new one to jell.
Besides, according to the study by Phillippa Lally, PhD, a senior researcher at University College London, indicates an average of 66 days to form a habit. In order to make a new habit automatized, the required time period may range between18 and 254 days.
Clearly, the 21-day rule is not a myth, but it is misinterpreted. Also, the 21-day rule is a good starting point because it is short and encouraging.
To summarize, you can start to see the initial results of your new habit-building efforts after 18 or 21 days. You will succeed with more dedication and consistency. So, keep on track and don't break the chain.
Comments