It Doesn't Take 21 Days to Form a Habit
The “21 days to form a habit” rule is one of the most persistent myths in self-help. The real research tells a different story: habit formation takes anywhere from 18 to 254 days, with an average of about 66 days.
But here’s what matters more than the timeline: consistency beats perfection. Missing one day doesn’t reset your progress. What derails habit formation isn’t the occasional slip—it’s giving up after slipping.