easy to estimate...BDROM has only a read rate of 4X, so if you have a 25gig movie to be read with a C2D or Phenom processor at max read rate a 2hour movie should be done by 20minutes much like DVD ripping before, however, it also depends on the efficiency of your software in decrypting and the processor being use. Like in the old days a 4.5Gig DVD can take to almost 45 minutes due to the early decrypting software and the max 4X read file which is almost always functional only at 2X.