Hello Longylong, the height might depend on what variety of box it is. If it's the very dwarf variety called Suffruticosa, then possibly not. If it's buxus sempervirens, (common box) it might get that high eventually but box is not a fast grower. You will have to keep the sides tightly clipped, whilst letting the top grow. We have an old box hedge which was about 6-8ft high when we moved in with horizontal branches 4-5ft long - not really desirable. The other thing to be wary of box, as I said earlier, that it's a greedy plant and if your customers/friends? have a border the other side, the box will spread its fibrous roots sideways and steal all the moisture and nutrients.
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