Welcome to CD Freaks.
Firstly edit your log file if you can & remove the Nero serial number at the top.
You seem to have 2 problems.
The first is that the DL media you're using is poor quality and liable to fail, especially when starting to burn the second layer. Only Verbatim +R DL media is worth using, everything else is just too risky.
Second, it shouldn't take 1hr 20mins to burn a layer.
CdRomPeripheral : LITEON DVD-ROM LTD163 atapi Port 1 ID 1 DMA: Off
DMA not being enabled on the reader will reduce the read speed so so much that it's untrue. See either this thread or download the VB script in my sig & run that with Explorer to fix this problem.
I would never ever use Nero to burn a DL disc , neither would I ever copy on the fly like you're doing. Both are prone to failure.
I would rip the disc to the HDD as an ISO image with DVD Decrypter & then burn that image with either DVD Decrypter or ImgBurn. This way you maintain the layer break position and don't get a pause in the play back that might otherwise occur.