Well, we don't HAVE to do it in 6 discs, it was just a thought. I mean, it's the best way I could think of to organize the six worlds. And we don't have to do every single song either, I don't think (there are, like, 50 songs, and some aren't even songs).
Plus, I didn't think it'd take that long, I thought, maybe, a LOT of people would try this, because as I said before, Rayman was (and is!) a very popular game, what with Rayman Designer and all. But maybe I'm wrong...
The way I see it, Serious Monkey Business has 35 tracks, and that took, what, two years? Where as Rayman only has 50 tracks (and we won't even do all 50 because about 10 or so are just sound effects, or not even music). Also, there are two tracks that are the same track, but one has the sounds of a rainforest in the background, so we can cut that one out.
EDIT: Oh, and one more thing. Two tracks are also similar, but not the same. If you put the disc into a music player, you will notice Track 15 is just a re-arrangement of Track 14. So we can skip Track 14.
So, all in all, I'd say we're looking at about 39 or so tracks. DKC2: SMB had 35, and it only took them two years. So just about four more tracks would be only a couple more months. That's the way I figure it.