Time to reach black belt is different depending on the style and the school. At my dojo, it takes between 3 and 6 years to reach black belt and at age 17 for children. The average time, however, is three years. Some people choose to take things a bit slower. For example, the belt system in my school is as follows : white belt 1st green tip 2nd green tip green belt brown tips brown belt black tips black belt For people who wish to take their training slower, or who maybe don't advance as quickly, there will be gold belt in between 2nd green tip and green belt, and orange belt in between brown tips and brown belt. A requirement in my school is that after you reach black tips, you need to work as an assistant instructor for one year before being permitted to test for black belt. Belt promotions are every six months (I'll be testing for Green Belt in August), but black belt testing is only once a year. Usually in October.