Yeh between 10-15 hrs...

I used to do it and it aint worth it !!!! When my pc was that slow
Just spend a little money and buy a dvd burner...I can't think of a bigger waste of hdd space than putting dvd movies on it....Divx yeh ok, or svcd (you can have subtitles with svcd) and I think even with divx from memory...

Now how often will you watch this movie from the hdd 1,2 or 3 times in how many weeks

The only thing which it may come in handy for is when you go on a trip and you want to watch movies in the car with no skipping etc...
But then I personally would have them in divx.....
