Someone might have already mentioned this, but the climate you live in will certainly affect the curing process. I cut and split my firewood (mostly pecan with some oak and cherry mixed in) in early July, and I think it will be just fine for burning when we start in earnest about a month from now.
I used to work in a furniture factory, and the smell coming from my wood shed reminded me of the dry kiln. We had months of miserable heat, even unusual for Georgia, this summer. The wood was "cooked". I will let the next batch cure for a full year, but, in my experience, wood stacked outside in our humidity will stabilize at about 15% moisture content and won't go any lower. Therefore, you just can't squeeze but a certain amount of moisture out of it, and letting it sit for a couple years doesn't accomplish much.