I'm not sure of any time I've heard of a house sitting empty for a year. Even in 2009. Until a few months ago, you had houses selling in hours/days, and even now it seems like they still move quickly.
What can I say. I have. The market goes up and down, and in down markets houses can sit for a long time. The last house I had was in a development with several homes in it for sale for over a year.