depends on the drives read speed that is the major choke point for todays computers most single 7200rpm hdds can read @ ~70mbps and aslong as you have a core 2 or better cpu your cpu wount even "break a sweat"
Hi
Single SATA II drives can reach almost 120 mbps read.
WD VelociRaptor is around 110 on average.
When Raid0 like mine I get average read speed of 180+.
When ripping pressed DVD's using patched f/w 16x max is achievable.
Most get 12x at best with pressed DL DVD's.
It is early days yet for Bluray.
However in my post I am referring to DVD's, as an example.
I actually state I haven't as yet bothered with Bluray, though have the capability.
You simply take my times & multiply to estimate how long Bluray would take.
(Bear in mind volume as well as speed needs to be accounted for.)
Easier is to look at length of movie & divide by the actual speed drive is capable of.
(Movie only - 2 hrs divide by max speed of drive 4x = 30 mins)
This is of course theoretical, however times should be within + 50 > 100% of this for most users.
Hence typical times of 45 > 60 mins depending on set up.