Hedgerow is right. Oak will keep well in log length, but it ain't losing any moisture until it's split and stacked. I've cut oak that was down 5 years or more, punky on the outside inch or two, but still solid in the middle and green as the day it fell.
I'll argue Bob's point, at least "here". Cut, split and stacked in the open with full sun and wind, oak cut this winter will be ready for the stove next fall. Your mileage will vary if cut and tossed in a pile in a hollow in the woods. Give any wood you cut the best chance you can to dry. I have it better than most with a lot of space to use, but find the best possible site for your wood stacks. It's worth a fight or two with the missus to put the wood where it has the best chance to dry.