If you have enough air getting into the heap, you don't need to turn it unless you are trying to speed up the decomposition.
The reasons I turn a heap for are: lack of air internally, making an addition of materials (usually manures)
Other than those two reasons, I never bother turning a heap (I have three going right now) it takes my heaps 4-6 months to finish out, I could shorten that greatly by building them in the
chicken area and might do that for the next batch of heaps this fall.
Redhawk