How long should it take shrink dvd to back up a dvd?

im currently using RITEK 4x + media it takes 30 min. shouldnt at 4x it take 15 or so minutes…what gives is it my Liteon 411s not detecting the media speed correctly or the program? ive noticed the 708A’s doing 7.5 min. backups with this media (tdk) at 8x so i would think the 411s should do it in 15 or so. Is the pioneer a06 better at this than the liteon?

Shrink doesn’t burn DVD’s, so your question is a bit confusing.
If you want to know what speed your drive is burning at, use Nero and watch the speed indicator. 4.4GB at 4x should be around 15-20 min.