how long to change a habit
When he became interested in how long it takes for us to form or change a habit, psychologist Jeremy Dean found himself bombarded with the same magic answer from popular psychology websites and advice columns: 21 days.hat 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.