I made a couple of 2P and a 3P RayWay tarp, following his designs (I started with a 2P kit), with varying tie-out lengths. It really doesn’t make much of a difference once they are long enough for your highest pitch. And the lines weigh very little. You can cut them down at home or in the field if you feel they are too long. But I’ve never had a problem that the lines are too long, but on occasion I wished one or more of them was a little longer, typically when stringing the ridge between trees.
I suppose if they are way too long you can get all kinds of tangles when putting the tarp up.