Clinically reviewed by Dr. Daniel Kaufmann, Ph.D., LMHC / LPC, ICGC-II, IGDC, BACC, Director of Gaming Services & Program Development at Kindbridge
It takes an average of 66 days to build a new habit, not 21, as the popular myth claims. In a world where we want everything right now, this stat feels like a groaner. But, based on the findings from a landmark University College London study, it’s good news disguised as bad news: if a habit hasn’t stuck yet, that doesn’t mean you’ve failed. It might just mean you’re in process, around day 40 or so.
Most people believe that building a good habit comes down to willpower. Try harder. Care more. It’s what I thought. However, it turns out willpower is a limited resource that can easily fracture at the end of a long day, and it’s not actually what habits run on. Habits run on structure.
Why Willpower Isn’t the Answer
Every habit follows the same basic pattern, often called the cue-routine-reward loop (a framework popularized by journalist Charles Duhigg in The Power of Habit):
- Cue: something triggers the behavior: a time of day, a location, an emotion, or another action.
- Routine: the behavior itself.
- Reward: what you get out of it.
Repeat this loop enough times in a consistent context, and the behavior becomes automatic, performed with little or no conscious thought. Researchers call this automaticity, and it’s what keeps a habit going without a daily fight.
Here’s the personal application. In my life, a new habit I started a year ago is to automate my coffee maker to brew a pot of coffee every morning at 6:45 am. Here’s how the reward loop worked for me:
- Cue: Mornings can be hectic with kids and work, and this was a small thing I could do to help them feel more in control.
- Routine: Prep coffee after 9 pm.
- Reward: No matter how I slept, or what was happening in the morning, I could always count on a well-brewed coffee waiting for me.
Reflection: For me, the pain was maintaining the routine, yet the consequences of skipping the routine had a bit of a sting. On the other hand, the reward felt like a win every morning (still does).
How Long Does It Actually Take?
In a 2009 study published in the European Journal of Social Psychology, researcher Phillippa Lally and colleagues at UCL tracked participants trying to build a new habit and measured how long it took each behavior to become automatic. The average was 66 days, but individual results ranged from 18 to 254 days, depending on the person and the behavior.
Two findings from that study are worth remembering when your own habit-building feels slow. Missing one day rarely matters: the study found that missing a single opportunity to perform the behavior didn’t significantly disrupt the process. What did matter was overall consistency: people who were very inconsistent were the ones who struggled to form the habit, not people who occasionally slipped.
Back to my coffee-making habit, … I don’t religiously prepare coffee every evening at the same time seven days a week. Maybe I miss a day here and there each week, but the reward keeps me coming back.
Three Ways to Build a Habit That Sticks
Start smaller than feels necessary.
Two minutes of the new behavior beats twenty minutes you end up skipping. A habit has to survive your busiest, most tired days to become automatic, so design it to be nearly impossible to skip.
Attach it to something you already do.
This is sometimes called “habit stacking”: linking a new behavior to an existing routine so the existing routine becomes the cue. For example, “After I pour my morning coffee, I’ll write one sentence in a journal.” Because the setting stays consistent, the cue is reliable, which is exactly what the UCL research points to as a key factor in habit formation.
Make the reward immediate.
Long-term benefits (better health, more savings, a clearer mind) don’t feel real day-to-day, so they’re weak rewards for a daily habit. Give yourself something that feels good right away instead: a visual streak, a favorite playlist, or a few minutes of something enjoyable immediately afterward.
Frequently asked questions
How long does it take to build a new habit?
On average, 66 days, according to UCL research, though the range across individuals was 18 to 254 days. Consistency matters more than speed.
What is the cue-routine-reward loop?
It’s the three-part structure behind every habit: a cue triggers a routine (the behavior), which produces a reward. Understanding your own loop makes it far easier to build a new one deliberately.
Does missing a day ruin a new habit?
No. Research shows that missing a single opportunity to perform a new behavior doesn’t significantly disrupt the habit-forming process. What matters more is getting back to it consistently.
My recommendation: just start and get help
Don’t allow yourself to be bogged down by thinking you need perfect conditions before starting. Start with small, repeatable actions. These will compound faster than you think. Start smaller than you feel necessary, anchor it to something you already do, and give it more than 21 days.
Getting help from a professional coach or counsellor will help you develop skills and meaningful goals, which will make the new habit process easier to commit to and also add an accountability component. Kindbridge offers a free 15-minute consultation to talk through what could help.