If you can find the correct video though that will cut your encoding time way down. Then you’d only need to pull the audio off the discs and can copy the video stream from the file instead of the disc. I’m not sure what movies you’re talking about so maybe that wouldn’t work either, but it’s worth mentioning.
Far more work than just acquiring a ready made one. It’s not worth your time to do all of them. Some so you can say you did it and know how, sure, but not all.
Exceptions are for anything you can’t find, of course.