There are alot of variables so your question cannot be answered per se. You can go all out on the video and cheap out on the audio when ripping. It also can come down to how long the movie was and at what resolution the guy ripped it to. I ripped a few of my own and the quality is as almost as good as the DVD it was originally came on. But I dropped the quality of the audio (hey, it's pr0n) and did it at a high resolution. They all came out to be around 700MB, which is a huge DIVX rip considering the movies are around an hour each.