November 12, 2015, 11:08:47 pm
I would suggest your friend upgrade his Lumion 5.0 Pro to the more recent version of v5.7.2
. Updates for aversion are free to licensed users, and there's all sorts of enhancements and improvements since v5.0 was released.
65 hours seems a long time even for a 1080p at maximum settings for the detail in your scene and a GTX 770. Did you do render it at 1440p?