In the woods behind my house (my woods) and down in a hollow. a large red oak fell several years ago. It was about 75 ft down a rather steep hill, but just below my wood shed. I didn't want to let all that good wood to go to waste and so I went down there and cut about half of it up: the big limbs, and the rest into rounds. I split the rounds in two (they were pretty heavy) and over a period of two or three days I carried what I had cut up to my wood shed. I left about forty feet of big tree trunk laying there, but I never forgot about it. I know that was about three years ago, maybe four. This year i walked back down there and looked at it again. All the outer part had rotted away and all that remained was the heart redwood, still 16" or better in diameter; that part was still as solid as a rock. Now I see why the old timers used this part of a red oak for roof shingles. So I took my saw and cut off a ten foot log and using a come-a-along, and a cable, I pulled it up near my wood shed, sawed it into 16" rounds and split it up. It's a beautiful deep red in color, and very dense, but it splits wonderfully well. I'm going back for the rest of it, but I will pull it up in shorter pieces, maybe 4' sections (it's still very heavy), make it pull a little easier.
East Tennessee red oak, even limbs, will rot down to the heart wood, but the heart wood will last a long time.