There's no fixed number. The 21-day figure seems to have started with plastic surgery patients, not with a study of habits. Researchers who did study new daily habits later put the point where they levelled off "after an average of 66 days", and the times in their study "ranged from 18 to 254 days". Old patterns keep their own time, and a slow one isn't failing.
The cutting has sat in a water glass on Graziella's desk for thirty days, and nothing about it has changed since the first.
She took it from a colleague's plant on the same Monday she made herself a rule about email: one read, then send. She'd read somewhere that a new habit takes twenty-one days, so she gave the rule three weeks.
Day twenty-one came and went. She still reads every message four times before it goes, even the ones that say "Thanks, received." Once she caught herself mouthing a two-word reply under her breath, checking its tone.
On day thirty-one, the woman at the next desk leans over to look at the glass. "Some root in a week," she says. "Some take a summer. Some never do, and nobody's to blame for that."
Graziella leaves the glass where it is and stops marking the days.
The emails still get read four times.
How long does it take to change a pattern?
It varies too much for one number. The famous 21 days doesn't come from a study of habits, and the 66 days is a researchers' average across a very wide range, measured on new daily behaviours. An old pattern runs to its own clock, with no date anyone can promise, and a slow one isn't failing.
A word on safety first. Some patterns are bigger than any article. Drinking, drugs, hurting yourself, an eating disorder, a diagnosed condition, someone in your life who harms you: each of those deserves real help from a GP, a psychologist or a helpline. Nothing below gives you a reason to come off treatment or medication, or to lean less on your support. Any habit that's guarding you against a danger right now should stay untouched. If you're in crisis, contact your local emergency services.
Where does the 21-day figure come from?
Not from research into habits. In a 2012 article in the British Journal of General Practice, three University College London researchers, Benjamin Gardner, Phillippa Lally and Jane Wardle, called the 21 days a "myth". They wrote that it "appears to have originated from anecdotal evidence of patients who had received plastic surgery treatment and typically adjusted psychologically to their new appearance within 21 days." The source they cite is a book from 1960.
So the number seems to have started with people adjusting to a new appearance after surgery. In time, it came to be repeated as a rule about habits.
What did the 66-day study actually measure?
It measured how automatic a new daily action came to feel, and when that levelled off.
The study was published in 2010 in the European Journal of Social Psychology by Lally and three colleagues. Ninety-six volunteers each picked something to eat, drink or do every day in a setting they'd keep, such as after breakfast, for twelve weeks. Each day they rated how automatic it felt. The 2012 article gives examples such as eating fruit or going for a walk.
In that 2012 article, the researchers sum up the result as automaticity levelling off "after an average of 66 days". The original paper gives the spread: the time it took participants to reach 95 per cent of their plateau "ranged from 18 to 254 days". The 2012 article adds that simple actions, such as drinking water, peaked sooner than more elaborate ones, such as fifty sit-ups.
That's good, useful work, and the researchers' own advice to doctors was practical: "it may be helpful to tell patients to expect habit formation (based on daily repetition) to take around 10 weeks." If you're building a new routine, that's a kinder guide than three weeks.
Anyone deciding where to start can talk with Sara, our veteran RS Method Master Coach, at no cost, over Zoom. Each call, in her booking page's words, is "A real conversation", and it lasts "20 to 40 minutes". Put a call in her diary. Or read on.
Why doesn't an old pattern keep to a calendar?
Because it isn't being built. Lally's volunteers were putting something new in place, repetition by repetition, and the days counted how long that took. An old pattern is usually the reverse. It's automatic already, often for years. It isn't waiting for a number of repetitions to pass.
In my experience, a pattern lasts while it still seems needed. Graziella's four readings may once have kept her out of trouble, after a hurried email caused some. A pattern doing a job like that pays no attention to how many days have passed.
Adding a routine and letting an old one go are both real work, and they often happen side by side. They just keep different time. The second of those is what what is unlearning explores.
Change sometimes feels sudden, and often it feels slow. Neither is a fault. I can't say in advance which way anyone's will go, so I give no one a date.
Is slow change a failure?
No. Plenty of patterns loosen gradually, through months of ordinary days, often with good support close by, and that's change too. The slow kind isn't a lesser version.
Lally's study has a detail worth keeping. Missing a day made little difference: "Missing one opportunity to perform the behaviour did not materially affect the habit formation process." For a new routine, then, one missed day isn't a reason to start again.
Old patterns can also come back after a quiet stretch, and that's no failing of yours either. I've looked at why they pull back so hard in why is change so hard.
You are not broken. You are buried.
What can a week of notes show you?
If you're in crisis, contact your local emergency services. Heavier patterns, like the ones named near the top of this page, go to a professional, never into this exercise. Any doctor or therapist you see stays involved just as before; a pocket exercise like this one doesn't count as therapy, or as medical care.
You'll need seven days and a scrap of card for your pocket.
- Settle on one small, low-stakes pattern. Arriving everywhere far too early, say, or tidying every room before a visitor comes.
- Don't add a count. No streak and no day numbers for this one.
- Whenever the pattern turns up, jot down what's around it. The room, how rested you feel, what you'd just been doing. A few words will do, with no judgement of how it went.
- Note the times it doesn't run, too. Same three details: the room, how rested, what came just before.
- When the week's over, read the notes once. Look for anything that turns up more than once, on either side.
- Stop on any day you choose. Talk any of it over with a therapist or a close friend, whenever you like.
Each line describes one day's conditions, and no line counts against you.
What could a first step leave room for?
If you'd like a free next step, the one I'd suggest is my Who Am I? masterclass. Three things make it suit a slow pace.
- It's made for return visits. Of its narrated video, the page's own description reads "The kind of content you'll come back to at different seasons of your life."
- A first viewing isn't the last word. Of that same video, the page also says: "Watch it once and feel it. Watch it again and understand it differently."
- It costs nothing. With the code GIFT26, it's free.
The masterclass ends on a guided session. If you've ever felt detached from yourself or your surroundings, as though nothing was quite real, or you're being treated for anything like that, ask your doctor's view before the guided session, or leave it out and keep the rest. Pausing is always allowed: the guided part can wait, and a call to someone you trust comes first.
Fifty sit-ups a day would take me well past day sixty-six.
Safae left this line in an Amazon review of Unbecome: "This is a different way of seeing life, of seeing ourselves and of living."
Robert Simic, guiding the remembering.
P.S. If your pattern is still running after the twenty-one days you gave it, nothing has gone wrong, with it or with you. Receive the Masterclass