How habits really form (and how long it takes)

Habits are the quiet engine of independent life. Once something is a habit, you do it without a daily argument with yourself. Here is what research actually says about building one, including the famous 66 days.

What a habit is, and why it saves willpower

• Habit researchers define habits as actions that are triggered automatically when you meet a particular cue, such as a time, a place or something you have just done.
• A useful way to picture this is a loop: a cue (for example, finishing breakfast), a routine (reviewing your lecture notes for 10 minutes) and a reward (the satisfaction of ticking it off, or a cup of karak afterwards).
• Because the cue does the work, a habit no longer depends on how motivated you feel that morning.
• This is why the same action at the same time and place every day is far more powerful than a big burst of effort once a week.

The 66-day finding, and the 21-day myth

• A study led by Phillippa Lally at University College London (published in 2009 in the European Journal of Social Psychology) asked volunteers to repeat a chosen daily behaviour and rate how automatic it felt.
• On average, automaticity levelled off after about 66 days, according to both UCL and a later summary in the British Journal of General Practice.
• The same summary stresses that there was considerable variation between people and between behaviours, so some habits form faster and others much more slowly.
• The popular idea that a habit forms in exactly 21 days is described in that summary as a myth.
• Practical meaning: plan for roughly two to three months of repetition, and do not be discouraged if it still feels like effort after three weeks.

Missing a day is not a disaster

• In the UCL study, missing the occasional opportunity to do the behaviour did not seriously harm habit formation.
• However, UCL also reported that people who were very inconsistent did not form habits, so repetition still matters.
• Rule of thumb many people use: never miss twice in a row. One missed day is a blip; two starts a new pattern.
• If you miss a day, do a tiny version the next day (two minutes instead of twenty) rather than nothing.

A six-step method from habit researchers

• Step 1: choose a goal you care about, for example 'keep up with my reading'.
• Step 2: pick one simple action that moves you towards it, for example 'read for 15 minutes'.
• Step 3: choose a consistent time and place, such as 'at my desk straight after breakfast'.
• Step 4: do the action every time that time and place come round.
• Step 5: expect it to get easier; the researchers suggest it can become automatic within about 10 weeks.
• Step 6: once it happens without thinking, celebrate: the habit is formed and you can add the next one.
• The same researchers suggest a simple tick-sheet to record each day you do it.

Making habits rewarding

• Researchers at Wharton tested 'temptation bundling': pairing something you enjoy (a 'want') with something you should do (a 'should').
• In their study of 226 people at a university gym, those who could only listen to gripping audiobooks at the gym went 51 per cent more often than a control group, although the effect faded over time and dropped sharply over a holiday break.
• Examples you could try: only listen to your favourite podcast while doing laundry, or have your favourite coffee only during your morning study block.
• Keep rewards immediate and small; a reward promised for the end of term is too far away to shape a daily habit.

Starting small

• Start with one habit at a time; trying to change your whole life in one week usually ends with nothing sticking.
• Make the first version almost too easy: one page, one push-up, one email, so that starting is never the hard part.
• Attach the new habit to something you already do every day, such as after a prayer, after brushing your teeth or after your first coffee.
• Once it is automatic, grow it gradually: 10 minutes becomes 20, one page becomes five.