Impressive numbers but for the wrong reasons 🙂 This is one case where extra time didn’t matter. All essential light elements/phenomena were present in the first image. In which case a simple denoise would have sufficed.
I would even consider the bold move of hard limiting all renders to less than 10hr. The Bella engine should not allow you to enter higher times. If the engine can’t do something in a max of 10hr just do something else.