if you want some pointers on ripping im happy to help if i can. did you mean you are using meguIVit? or the straight MeGUI? by the special avisynth script do you mean QTGMC? (written by vit) or the original TGMC?
depending on settings (and your computer of course) a rip could take anywhere between 17 hours (as yours did) or 4-5, giving very similar results.