How Long Does It Really Take for a Habit to Stick?

There is no single exact number of days, valid for everyone, in which a new habit settles; the time changes with the habit itself, with the person and with how consistently it is repeated. What matters is not waiting for a number but keeping the repetition unbroken. Rather than giving a fixed number of days, this article describes how you can tell when a behavior has really become automatic.

Why treat claims of an exact number of days with caution?

The claim that a particular number of days holds for every habit forces different behaviors and different people into the same mold. A simple habit such as drinking water and a habit that takes time and planning such as an evening walk do not settle at the same speed.

This is why Dada Diet gives no definite number of days; it describes what the process depends on instead. The idea that a single number can be applied to all behaviors pushes people to wait until a certain date and, if they are still finding it hard on that date, to think "I have failed"; whereas the process already moves along a range that differs from person to person.

What actually sets the time?

How fast a behavior turns into a habit changes with how often it is repeated, which moment of the day it is placed in and how demanding it felt at the start. A simple behavior repeated at the same hour every day becomes automatic far faster than a complicated behavior done at irregular intervals.

A new behavior added to an existing routine settles faster than one built from scratch as well; drinking a glass of water right before brushing your teeth, for example, settles more easily than trying to drink water at a random hour in the middle of the day, because it is added to a cue that already exists.

Does skipping now and then start the process over?

Skipping a day does not reset the process of building the habit; what decides it is that a general pattern of repetition carries on without long breaks. That means there can be occasional slips, and those slips do not mean the process has failed.

The problem lies not in a single skip but in not starting again after it. Seeing a missed day as "a broken process" and giving up entirely is a far greater loss than the single slip itself; carrying on the next day from where you left off is enough.

Why does starting small give a more reliable result?

A habit started with a large and demanding goal can turn, after the first few days, into a load that is hard to keep up. Starting with a small and easily repeatable behavior, a short walk at the same hour every day for example, makes it easier to hold the consistency, and the length or the intensity can be raised over time.

Repeating small steps often gives a more lasting result than repeating a large step rarely. Keeping the goal small at the start leaves room to raise it as you go; the other way round, starting large and cutting back usually feels like giving up.

How do you tell the habit has settled?

A behavior has turned into a habit when doing it no longer takes conscious effort or a reminder; the behavior becomes a natural part of the day. The reverse is a sign too: if a behavior still takes pushing yourself every time, it has not settled yet, and that is normal. That moment of transition differs from person to person and from behavior to behavior; looking at that change is a more reliable sign than waiting for a fixed date.

The most consistent way to shorten the process is to tie the behavior to the same context, the same hour or the same cue every time; the more fixed the context, the less effort it takes to remember the behavior again. Placing the new behavior somewhere visible has the same effect; putting your shoes by the door for an evening walk, for example, takes less effort than remembering it afresh every time.

Adding the new behavior right after an existing habit works similarly; doing a few stretches while waiting for the coffee to brew, for example, settles more easily than setting aside a separate slot of time. Rather than forcing the process, making small arrangements that ease the repetition is the most realistic approach to speeding up the result.