I could go either way, but I'm kind of leaning towards a short one given the state of my CS and since I'm not sure how much M'arash's followers would have affected the world in that long of a period. High fantasy would be interesting though.

Edit: I guess the Yanites could stay relatively hidden from the rest of Tabrasa over the course of a thousand years...other than that, the rest of my sheet can stay as it is, minus some date changes, with the longer timeskip.