Does your client live far away? If your client lived nearby then I would copy the video (entire 12GB) onto the computer hard disk and then put the file onto a portable USB hard disk, one of the chain stores is selling a 500GB drive for around £75/€99. Then take the portable hard disk to the client and connect it up to his/her computer and transfer a copy of the file across, that's one way of keeping everything together and still in HD quality, providing you select HD settings when you create the initial project in the capture software.

If your client doesn't live nearby then you will have to chop up the 12GB file, put it all on the timeline, play it from 0 to 20 minutes, cut it and get rid of the rest, then Export movie to AVI and render that section. Then do the same for 20 minutes to 40 and from 40 to 55 or whatever is left so you end up rendering 3 separate files, each one to its own DVD. You could put the entire 12GB on one DVD but it would be compressed and defeat the purpose.

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