Sorry for the lack of information.
Being part of a set of images, this particular one was conceived as the one able to convey the quiet and silence aspect of camping in Wales.
Grass and trees are scattered with Forest Pack. The trunk on the left is from megascans as the stones in the foreground.
Volumetric light in a big box although the layered mist as been put in postproduction by duplicating the volumetric pass and playing a bit with masks.
In terms of time, I left my computer rendering thorough the weekend, although after 8 hourse the image was already clean.
Thanks for your appreciation.
F