Forever -- because there were huge periods of time in which I did not work on it at all. I started writing it in college and then finally called it done in 1998. There it sat until recently, when I decided it was time to get off my behind and have it see print. The copyright on it says, "1998, 2003."
I'm working on a science fiction novel that I think is actually better (Demon Lord was the first novel I ever finished -- I've started many), but it's still in draft form. I also am planning on writing a relationship book, a self-help type text.