It's not a question of minutes, it's a question of the bitrate that the video is encoded. Higher bitrate, larger file sizes.
If you really need a lot of information about the BASICS of DVD creation, the place I would go to is
www.videohelp.com There's a really large group of users, so there are tons of threads and places to read about DVD creation. There aren't as many people involved in this forum, so you might be much better served checking videohelp first.
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