I don't know exactly why you labeled your post a VCD bandwidth question since VCDs are mpeg-1 at a constant bit rate (1150kbps video, 224kbps sound) ... unless that is what you wanted to know.
But anyways, getting back to your post, you can get a little over an hour of footage onto an 80min CD ... so for each 6 hours tape, you would need like 6 80min CDs. Oh, and yeah, 80min CDs should play back no problem in your DVD player ... assuming it can read CD-Rs to begin with ...
I hope this helps in some way ...