I will measure at home. But IMO that's an important thing, especially for armies that have stuff on small bases, like Seraphon, Skaven(?), Deathrattle, and a few others.
If my third row of Skinks is out of range when the first row is 14" away from the enemy that is BOOOOOO. Skeletons aren't exactly the best melee units in the game, even though they have small bases, I see no reason to take that away from them as well.
Then you might just base them on 32s, it wouldn't change much, except having more space for nice basing.
I even believe that Dryads are on 32s on purpose, although they would fit nicely on 25s, just to make them not OP.
I can hardly imagine there was ever a player in AoS history who whined about Deathrattle being OP because of three ranks of Skeletons demolishing him.