For your system and a reasonably complex scene with Gi or GR lighting could literally take hours, I've had 10+ hour renders in Vue6Inf, although my render times have decreased big time since I upped my pc spec.
Also if you have water in your scene that will increase render times by a lot too!
But I have to say the end result in Vue is worth the wait.
Also don't forget Vue has the option to stop the render and resume at another time as long as no changes were made to the scene in between!

Injustice will be avenged.
Cofiwch Dryweryn.