Hi,
Here a test render done with Cycles and Octane,
Samples was 2000, time take by Cycles was 44:42 and Octane was 18.22.
One sun light use in Blender and Octane.
Octane hotpixel removal set to 1.0 for image name Octane_01
and set to 0.0 for image name Octane_02.
Still lot of noise for Octane.

I ...