You've heard it takes 21 days. That came from a plastic surgeon in 1960 watching patients adjust to nose jobs. No study. No data. Just an observation that a self-help book turned into gospel — and that millions of people turned into evidence that something was wrong with them when they stopped at day twenty-two.

University College London. 2,600 people. Real habits, real timelines. The actual number? Sixty-six days. About five months. And missing a day here and there barely mattered at all. The only thing that mattered was coming back.

Five marks. Five months. One habit formed. One version of you that couldn't have existed without them. The name isn't a design choice. It's the science.