I also see that you render with IDL ON, That is GOOD.

Do you have an IBL light in your scene? With AO ? That would be NO Good .

Choose.
It is one, or the other.

Render with IBL+AO? ? ? ? Or ? ? Render with IDL, but then without IBL+AO.

Use a single Infinite light for the sun, and render inside BB's free sphere to create the IDL.

Rendering with IDL + an IBL light + AO, and you are going for extra long render times. They have a nasty habbit to fight internally. LOL; No LOL actually. LOL.

With a machine with a CPU with 8 threads?
For any render taking more then one hr to finish, it is time to search where the problem is.

Mostly the culpit is the combination of IDL +IBL+AO. The obvious and most realistic solution is to drop the IBL+AO light.

All my "outside" renders are done inside the BB sphere and with one single Infinite light playing "sun".
There is only one sun out there. All other lights have to go.

Happy Posering.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!