My serama hens are very tame and I have observed nesting/brooding behavior often. Egg turning looks to be random when the hens turn their eggs; they run their beaks through the nest causing the eggs to turn, most often egg turning is a few wiggles, shuffles of the hen's body. What seems the most important is that the eggs move-a little-a lot. Overall I doubt it matters if each time the "turn" is exact.
