How long do dreads take to grow?

Turning away from a pile of paper work Dr Edd Says.....
In the first year your locks will not grow, they will shrink as they tighten! By the second year they will start getting a little length to them and by the third year they will grow more in this year then they did in the first two together! When dreads are fully established they grow pretty fast, at about 1/3 of the rate that normal hair grows so you can expect to get about 2-3 inches of growth every year.