Hello. So most scenes I do go pretty quick, but this scene with atmospheric volume I have spent several days just trying to get a single frame final render out. The best I got is 5 hour render before I hit a cuda error. After 5 hours it was still full of noise. I am going to try using the gpu with CPU as a fallback in case of error. I believe the time is mainly due to having atmosphere and many area lights.
I am about to try some new settings including adjusting light linking.
By the way I have three Titans and I am seeing only one is being used during the render which is upsetting.
If anyone can help me, I would be really grateful.
My scene is located here: https://www.dropbox.com/sh/syo58zamrrb7bpv/AAAbquAvhQJsLrIVYqoyBJvxa?dl=0
scene will need to be restarted and played to about frame 40 for nparticles.
update: This latest file is giving me fatal errors now. i may have to switch to redshift. I'm out of ideas.