Now that is a hard one, 1 don't know were you live. 2 That has a lot to do with the kind of dirt it will be planted in, some grow faster then others, sorry I know this was no help at all
well you would know more then I do, on how your dirt is, mine well started out slow but the next one I planted I went to a nircere and got some really good dirt and they grew a hole lot faster for me