Took me just 68min to make copy of KK on a DL dvd!
68 min? If you burn on a dual layer you don't need any compression: it's sufficient to rip the disc and burn it directly. What did you do that requires 68 min?
That seems about right.
20 mins to rip and 45 mins to burn at 2.4x
I would suggest if you are burning DL disc that you don't use CloneDVD as it does not place the layer break correctly. Use DVD Decryptor and Img Burn or CloneCD and AnyDVD.