Many years ago when I was just getting into woodburning I got some Oak and I tried using it drying it the same time frame as other woods that I had, not knowing how long it holds it's moisture, and it didn't burn well and I remember thinking "I thought this was supposed to be primo fuelwood?" and was disappointed. A few years ago I got my hands on some more and since I had read about it taking time to dry out I did just that, and the difference is very much noticeable!
I don't know how it manages to hold onto it's water weight so long but it does, but when dry burns oh so nice!!!