Multiple audio tracks, how many can typically fit on a dvd?

Hi...
I am working on a yoga video, which is planning to have approx 5 audio tracks for voice (planning to be randomized on playback) so the dialog stays more fresh.
Ok.. Question is.. We also have a director commentary track.. So... Thats 6 tracks...
Then we need to have music on/off options.. so thats now-- 11 tracks (5 tracks with voice-over and music, 5 w/o music, 1 commentary track).
The length of the video for this is approx 55 minutes. Though the dvd will feature other video content with the length of about an hour (but without multiple audio). So-- 11 audio tracks over 55 minutes, and 1 audio track over 60 minutes.
Is this going to be a problem? I don't know very much about the different types of dvds out there, capable of holding more data than others.. So I just am trying to get a sense of what is going to be needed to accomplish this.
Thank you in advance for any advice provided.
-patrick

I'm not positive, but I think that 8 tracks is the limit. Perhaps you could think of having music as a random element, giving you 7 random tracks (four that happen to have music) plus the director. Otherwise you're stuck with three random tracks that can also have music turned off (hey, why not have the director with and without music too!). Or get rid of the director and have four random tracks with and without music.
As for whether it'll fit, you want to keep below 8 megabits per second, and for nice sounding stereo music and voice you would use 192 kbps for each sound track. With eight that is about 633 MByte of the disc space. It could be less if you want to use 64 or 128 kbps in the case of there being no music.
Taking the better case, you have about 3.7 GBytes of space for the 55 minutes of video. That's still a high data rate for the video (well over 8 mbps). So the real limit is keeping the total under 8.
The 8 sets of 192 kbps uses about 1.5 mbps, so just use about 6.3 mbps for the video. It'll look great, and the eight audio tracks will work fine.
Another option you have is to duplicate the video track. One copy of the track would have the with music versions, and the other track would have the without music ones. That lets you have seven variations, plus the director one. You wouldn't easily be able to make an on the fly change of mind about having music.
The figures then come out to making the video at about 4.4 mbps, which would still look good.

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