So, I think I should mention that I have the benefit of already being a computer nerd and my kids have moved out…
I have also already discovered that the AutoTileSize AddOn works perfectly so…
Rendering on CPU took about 1:30:xx.
Rendering on GPU for me took about 0:27:xx.
Rendering 100% at 2560x1440 took 2:10.xx.
I use a 16 threads 4GHz CPU.
The GPU is dual GTX1080.
Oups, I just learned from you guys that my GPU is better than I thought 
GPU => 23s (0:23:xx)
The 2560x1440 now at 1:59:xx. Tile size is important!


