I have a stack of lumber( oak, walnut,ash, cherry mixture) about 5'X3'X 4" air drying for about a year I checked it the other day and It is at 8% moisture, so it is ready to plain. what you get from lumber yards is about 10% moisture when planed, I have used air dried for several years now. When stacking I paint the ends with a good heavy coat to keep it from splitting.
IKE