So I've been optimizing the scene and the lowest I could get down to has been ~40 minutes per frame (I have to deal with a total of 37 frames for the current scene). I have Volumetric fog on the scene and rendering in 3840x1920.
Specs:
Win 10 64 | Geforce RTX2070 SUPER | i7 9700K | 32GB
Here's my render settings:
Edit: I got it down to 25 minutes per frame which I'm pretty happy with, I lowered the max. samples to 2100, and got rid of some fairly detailed objects on the interior of the scene.