Have you ever tried to form a new habit, only to give up after a few days or weeks?
Whether it’s hitting the gym, eating healthier, or practicing a new skill, forming new habits can be challenging.
But how long does it really take to form a habit?
Is it really possible to adopt a new behavior in just 21 days, as some say, or does it take longer?
In this blog post, we’ll dive deep into the science of habit formation and explore the truth about how many repetitions it really takes to form a habit.
Inside this Article
The 21-Day Myth
The 21-day myth has been circulating for decades, claiming that it takes just 21 days to form a new habit.
However, this idea is not entirely accurate.
Research has shown that the time it takes for a behavior to become a habit varies widely depending on the specific routine and the individual involved.
A study published in the European Journal of Social Psychology found that it took participants an average of 66 days to form a new habit, with the range being anywhere from 18 to 254 days. This suggests that forming a new habit requires much more than just a few weeks of repetition.
It requires consistent effort and dedication over an extended period. So, if you’re trying to adopt a new behavior, don’t be discouraged if it takes longer than you expected.
Keep at it, and eventually, it will become second nature.
Explanation of the 21-day myth
The 21-day myth may have originated from a book by Dr. Maxwell Maltz, who observed that it took his patients about three weeks to adjust to changes in their physical appearance after plastic surgery.
Maltz wrote about these experiences and said, “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.”
In his book “Psycho-Cybernetics,” author Maxwell Maltz inspired self-help gurus (like Tony Robbins, Brian Tracy and others) to teach that forming a habit takes 21 days. This is how this myth became a popular belief.
However, this observation was not based on scientific research and has since been debunked.

It’s important to note that the process of forming habits is complex.
It involves many factors, including motivation, environment, and individual differences.
Some habits may be easier to form than others.
Why the 21-day myth is flawed
The 21-day myth is flawed because it oversimplifies the complex process of habit formation.
While repetition is essential for building new habits, it’s not the only factor at play. Motivation, environment, and individual differences all play a role in shaping our habits.
Additionally, forming a new habit requires consistent effort and dedication over an extended period, which can vary widely depending on the behavior and the individual.
Rather than focusing on a specific timeline, it’s more important to approach building habits with patience and persistence, focusing on small steps and gradual progress towards your goal.
The 66-Day Theory
The 66-Day Theory proposes that it takes an average of 66 days for a behavior to become automatic, which is a more accurate representation than the 21-day myth.
The study found that the time it took for participants to form a new habit varied from 18 to 254 days, with an average of 66 days. This is around 2 to 3 months.
Explanation of the 66-day theory
The 66-day theory proposes a more nuanced understanding of habit formation, acknowledging that the process is highly variable and dependent on various factors.
While repetition is important, it’s just one piece of the puzzle. Motivation, environment, and individual differences all play a role in shaping our habits.
While the 66-day benchmark has been proposed as an average time for habits to form, individual experiences vary greatly.
The authors also highlight the role of individual differences in habit formation, such as personality traits, motivations, environments, cognitive abilities, and prior experiences. People with certain characteristics may find it easier or more challenging to establish new habits, depending on how these factors interact with the specific habit they are trying to adopt.
For some people, habits may take longer than 66 days to form, while others might be able to establish them more quickly. Additionally, the complexity of the behavior being changed can also play a role in the process.
More complex behaviors may require more time and effort to become habitual. Despite these variables, the 66-day theory provides a useful timeframe.
In summary, the study underscores that a one-size-fits-all approach may not be appropriate for habit formation. Understanding and catering to an individual’s unique needs and circumstances can increase the likelihood of successfully developing and maintaining new habits.
Benefits of sticking to a habit for 66 days
Sticking to a habit for 66 days can have numerous benefits, both physically and mentally.
Research has shown that forming new habits can lead to improvements in overall health, increased productivity, and reduced stress levels. By committing to a new habit for an extended period, you can create a sense of discipline and self-control that can spill over into other areas of your life.
Forming healthy habits, such as regular exercise, a balanced diet, and sufficient sleep, can contribute to better physical and mental health. These habits can help prevent chronic illnesses, boost the immune system, and improve mood.
Similarly, developing productivity-enhancing habits, such as effective time management, goal setting, and task prioritization, can lead to increased efficiency and output in both personal and professional contexts. As people become more productive, they are likely to experience a sense of accomplishment, which can contribute to improved well-being and satisfaction.
Finally, forming habits that promote stress reduction, such as mindfulness practices, meditation, or engaging in hobbies, can help individuals manage their stress levels more effectively. These habits can contribute to better mental health, improved focus, and increased resilience in the face of challenges
Additionally, the act of forming new habits can help you develop a growth mindset, where you view challenges as opportunities for growth and improvement.
By focusing on small steps and gradual progress towards your goal, you can build momentum and create lasting positive changes in your life.

Factors That Influence Habit Formation
While the 66-day theory provides a general timeframe for habit formation, there are several factors that can influence the process.
One such factor is the level of motivation and commitment towards the desired behavior change. Individuals who are highly motivated and committed to their goals may be able to form new habits more quickly than those who lack motivation or have competing priorities.
Another factor is the level of environmental support for the desired behavior change. Creating a supportive environment, such as enlisting the help of friends or family members, can make it easier to stick to new habits.
Finally, individual differences in personality and temperament can also impact how long it takes to build a habit. For example, individuals who are more impulsive or easily distracted may struggle with forming new habits that require sustained focus and attention.
By taking these factors into account and tailoring strategies accordingly, individuals can increase their chances of successfully forming new habits and achieving their goals.
Complexity of the habit
Another factor that can impact building a new habit is the complexity of the behavior being changed.
More complex habits, such as quitting smoking or overeating, may require more time and effort to become habitual than simpler habits like drinking more water or taking a daily walk.
Additionally, breaking down complex habits into smaller, more manageable steps can make the process feel less daunting and increase the likelihood of success.
It’s important to approach habit building with patience and persistence, focusing on small steps and gradual progress towards your goal, regardless of the complexity of the habit.
By doing so, you can build momentum and create lasting positive changes in your life.
Level of motivation
It’s essential to have a strong desire and commitment to the goal to increase the chances of success. Motivation can be influenced by various factors, such as personal values, intrinsic rewards, and external incentives.
Intrinsic motivation, which comes from within, tends to be more effective in sustaining new habits than external rewards. Creating a sense of purpose and meaning around the desired behavior change can also increase motivation levels.
By understanding the role of motivation in building habits and tailoring strategies accordingly, you can increase your chances of successfully forming new habits.
Environmental support
The level of environmental support for the desired behavior change is another crucial factor.
Creating a supportive environment can make it easier to stick to new habits and increase the chances of success. This can involve enlisting the help of friends or family members, setting up reminders, or removing obstacles that may hinder progress.
Additionally, creating a sense of accountability by sharing goals with others or tracking progress can increase motivation and commitment towards the desired behavior change. By taking steps to create a supportive environment, individuals can increase their chances of successfully forming new habits and achieving their goals.
Burstiness
Another factor that can impact your success is the concept of burstiness.
Burstiness refers to the variability in the frequency and intensity of behavior over time. In other words, some habits may be more sporadic than others, making them more challenging to form.
However, by breaking down bursty habits into smaller, more manageable steps and focusing on consistency over time, individuals can increase their chances of success in forming new habits. It’s essential to approach the process with patience and persistence, focusing on small steps and gradual progress towards your goal, regardless of the burstiness of the habit.
By doing so, you can build momentum and create lasting positive changes in your life.
Cue-dependent behavior
Another factor that can impact the process is the concept of cue-dependent behavior.
Cue-dependent behavior refers to the idea that certain environmental cues or triggers can prompt individuals to engage in specific behaviors, even if they are not consciously aware of it. For example, seeing a bag of chips may trigger an individual to eat even if they are not hungry.
By identifying and modifying these cues, you can increase your chances of successfully developing a habit. This can involve creating new cues or replacing old ones with more positive alternatives.
Identity-based habits
Identity-based habits refer to the idea that individuals are more likely to stick to habits that align with their self-image and personal values. For example, someone who identifies as a “healthy person” is more likely to stick to a habit of regular exercise than someone who does not have this identity.
By aligning habits with personal values and beliefs, individuals can increase their motivation and commitment towards the desired behavior change. Additionally, focusing on building a positive self-image around the desired behavior change can increase the likelihood of success in forming new habits.
Habit stacking
Another variable that can impact the process is the concept of habit stacking.
Habit stacking refers to the practice of linking a new habit to an existing one, creating a chain of behaviors that become automatic over time. By leveraging existing habits, individuals can increase the likelihood of successfully forming new ones.
For example, if someone already has a habit of brushing their teeth before bed, they could stack a new habit of reading for 10 minutes before turning off the lights. By consistently practicing this new behavior in conjunction with an existing one, it becomes easier to maintain over time.
Additionally, habit stacking can help to create a sense of momentum and progress towards larger goals by breaking them down into smaller, more manageable steps.
Consistency of behavior
Consistency of behavior is a critical factor in breaking bad habits and forming new ones.
It’s essential to approach the process with patience and persistence, focusing on small steps and gradual progress towards your goal. By maintaining consistency in your behavior, you can build momentum and create lasting positive changes in your life.
However, it’s important to acknowledge that there may be times when maintaining consistency is challenging, such as during periods of stress or change. In these situations, it’s helpful to have a plan in place to help you stay on track and maintain your habits.
This could involve seeking support from friends or family members, using reminders or cues to prompt behavior, or finding alternative ways to engage in the desired behavior.
Conclusion: How long does it take to form a new habit
In conclusion, the idea that it takes 21 days to form a new habit is a myth.
The reality is that habit formation is a complex process that varies from person to person and depends on a variety of factors, including the complexity of the habit and the individual’s level of motivation and self-control.
While some habits may be easier to form than others, research suggests that it can take anywhere from 18 to 254 days for a new habit to become automatic.
The 66-day theory, proposed by Phillippa Lally and her colleagues, suggests that it takes an average of 66 days for a new habit to become ingrained in our daily routines.
However, this is just an estimate, and the actual time it takes to form a new habit can vary widely depending on individual circumstances.
By understanding the science behind habit formation and implementing effective strategies for building new habits, you can create lasting positive changes in your life.
Ultimately, the key to sucess is patience, persistence, and a willingness to adapt as needed. By implementing effective strategies for building new habits and breaking bad ones, anyone can create lasting positive changes in their lives and achieve their goals.



