For females, it can range from 3-4 years roughly. I bought an '03 CBB female in 2004, and this year she is up to breeding weight (over 1800g.) That's roughly 3.5 years give or take. It all depende on their feeding and what temps they are kept at, as well as genetics; an underfed snake will grow very slow.
I have never personally raised a male from hatchling (or juvi) to adult, so I will leave that to someone else.