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What this research suggests is that 21 days to form a habit is probably right, as long as all you want to do is drink a glass of water after breakfast. Anything harder is likely to take longer to become a really strong habit, and, in the case of some activities, much longer.
Where to Go From Here. At the end of the day, how long it takes to form a particular habit doesn't really matter that much. Whether it takes 50 days or 500 days, you have to put in the work either way. The only way to get to Day 500 is to start with Day 1. So forget about the number and focus on doing the work.