Talo,
As an author with a story on the Castle, let me tell you. My story wound up averaging one year per chapter. The first ten took about 18 months. The last 5 took over ten years. I knew where I wanted the story to go, but getting it there was not so easy. I challenge you to try and write something worthy of the Castle. See how long it takes you to get 15 or twenty chapters in a cogent order.
Curt