The dead rock should become "living" pretty quickly. BUT..it depends on what your requirements are for "live". Bacterium will reproduce quickly. Pods, worms etc. will more likely find the nooks and crannies sooner than you'd think. But developing coralline, or other slow growers may take some time. Personally, I'd keep it in contact with mature rock. Even better, I'd find a smallish (golf ball or so) sized piece of mature live rock and pulverize it, sprinkling the rubble over the new rock.
Dave
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