10 years.
Guys don't put tons of pressure on him, it'll take forever to get the whole thing done without bugs. Asking him that question will just give you a horribly estimated number resulting in probably dissapointment. The main thing I see the problem in most of these OOT2D projects is that the creators release it too early with tons of bugs and not much features. I'd at least get done with the Deku Tree before I give a demo out, that would end before the deku tree. So you're always ahead of the demo by a bit, and you only post new demos on major milestones, like the entire Deku Tree, then the entire Hyrule Castle all the way to Zelda, then to Death Mountain, then Dodongos cavern. Big updates are better, because that way people will have time to explore them quite a bit. I guess we're just here to test the glitches anyway.
I just feel people are too rushed to show what they have. I suggest you just go for the major demos, not small stuff. Getting a team as well, because you're gonna need help spriting things that haven't been created yet.
Oh, and something for the fans. Don't expect something like this to be done quickly. Don't pressure him to get something done, because we all have lives. I think I'd be better off posting this on GMC though, this place isn't flooded with immature people.
-Ethelon
EDIT:
Oh nvm Jeod, I thought you meant the whole game, not just the deku tree. Okay then...