Autumnwatch Tower svcks! I just spent one whole hour trying to defeat the Dragon there! In game terms, I got there about 5PM. After also clearing Arcwind Point it was 6AM!
What is bad is that Arcwind Point is just on the other side of the mountains behind it, so inevitably, the Dragon will see the skeletons and Draugr there and start attacking the place. So, if you follow, you get thrown into TWO Dragons AND a lot of Undead fight.
Or... You can wait forever and a day for the Dragon to return.
I really do not mind Dragons that fly about, but it really can be frustrating at times