I stability tested Prime95 blend for 8+ hours and Memtest 86+ all night when I had two other coolermaster fans in my case with CPU: 3600MHz @ 1.4v / NB: 2400MHz @ 1.2v and RAM at those speeds apart from the final tweak which was the Trc following AMD's Dragon Tuning guide.
The last benchmark I ran with those settings was for roughly 90 minutes.
I am just about to run a 2 hour OCCT test, and then will run another 2 hour LinPack test.
Once I have my two quiet fans and the controller in (hoping Wednesday) I can give it another overnight torture test with blend, although the pc is in the bedroom and the fan noise us when trying to sleep
Am hoping I will end up with a nice fast but also quiet pc