It really depends on your area (climate) and soil As well as when (at what size/height) they are planted and how long ago and what prep the site had, or will have They are not rampantly fast growers but moderately so... and can be pushed along with extra care, if that's what you are looking for. Otherwise, they can also be kept quite tame but survive in poor soil
Do you have, or are you just considering, and if so for a screen or what?
I just love them as they are so adaptable