Don't know from experience, but a year out is pretty long... for pretty much anything whether it is games, movies, or books. The only time I have seen that much time during a preorder would be for crowd fund perks. Part of it is because you want the hype to maintain. If you do it a year in advance, people may even completely forget about the book until they get an email saying it is ready.
I also found this article that seems to share similar views about the length but they even go further to suggest that preorders may not even be as good as you may think. I don't know how reputable the link would be but I think they do provide an interesting point of view too about publishing (though this is mostly in regards to people who self publish through Amazon).