My guess is that it will take as long as it will take. Renara might be able to come up with an estinate of how much longer it will take to get to a point where the bare bones are done, and it could be considered a propper game, but without anything that extra time would improve. Plus, it's been a long time since January 2010, project staff have gone their own ways and new ones joined (as I understand it), and Renara has had computer problems. So, it'll be done when it's done, I guess.
Plus, I don't agree with Blue's statement. If you have a number of people working on their own computers and (presumably) on their own things, then getting two or more of them in the same room, on the same machine, to work on their different things, would slow the individuals down. You would get 100% useage out of the machine, but only 50% out of each person