Thanks for the quick replies guys!
The reason I ran the test for 30 hours is that I simply left the thing running over the weekend in our lab.
New PCs smell pretty bad in my opinion while they are venting all the flame retardants and other stuff left over from the manufacturing process....
So, I just bought me a new rig after reading up on other people's experiences here at the forum. I've been lurking for a while... ;-)
Once everything had been assembled, I ran the usual burn-in procedure we use for all our new systems. This consists of running a software called BurnInTest...