I don't think you've got a lot to worry about, most non-pow boards are of a similar shape so the effective edge doesn't differ greatly. I know with rocker skis it's an issue as the weighting is based in the center of the ski, but snowboards are different.
There are some decks with blunted tips that mean you can ride them a bit shorter because the edges are pushed closer to the tips because of the shape, but I don't think anyone really goes into exactly how long the edges are. More like, oh, the tips are blunted, maybe i'll go for a 155 rather than a 159 or something.
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