I've never mentioned 10gb/hour for DVD, aside from it (maybe) being an average data size, for whatever that conversation was. Instead, pay attention to bitrate.
DVD-Video is capped at 9.8mbps audio+video, so that's the max. It will yield about 1.5 hours on a DVD9 (DVD+R DL).
Max SD, and for DVD-Video, is also capped at 720x480-576.
I often use 352x480, especially using DVD recorders, even now, to record B&W movies, game shows, and cartoons to HDD. Transfer to DVD, rip to computer, edit, store on network share as MPEG. Just 4x3 content, rarely 16x9.
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