Right now, today, I have several writing/publishing tasks to do:
So, considering that a typical day might have some or all of these elements running, it's hard to put a clear label of how long it takes to write a novel. The short answer is that in the past, I've written two novels a year. But that was before a lot of this publishing, marketing stuff got in the way.
Oh, yes, and I have to have a life fitted in there somewhere.