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BTR88
It's a bit less than that, as the cap itself is 3mm internal depth, and you don't want the steerer to be touching the cap once everything is snugged up. Fork manufacturers vary in their recommendation for steerer projection through the stem, although I think the ones who say 5mm are basing that on the scarcity of spacers smaller than 5mm. Any projection at all solves the 'coning' issue, after that there is a diminishing return as the stress peaks at the top of the stem clamp and fall off rapidly as you go up the free steerer.
@veLLo the caps come with a 30mm long M6 Torx countersunk screw which lies flush with the top of the cap when installed, silver caps get silver screws.