Apparantly it's 74 minutes with 2-channels. Less with more. I honestly don't see the point of such super-high-completely-uncompressed bitrates. I'd rather see, say, 4 or 5 hours of 6-channel audio on a disc as a bare minimum. I mean a DVD movie's VIDEO track has a maximum of 10Mbps -- who needs 9.6Mbps for just AUDIO?