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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.
It depends on how complex the habit pattern is. You can develop a simple habit pattern in 14 to 21 days. For example, if you want to begin getting up half an hour earlier so that you can plan and organize your day, it might take just two to three weeks to develop the habit.