What is the cause of such long single frame renders? Mine never take longer than an hour. Is it because your're doing a Firefly with lots of reflective material? Is it your render settings? I mostly just do P4 renders in P5 unless I want a mirror or similar in my scene. I often hear people saying that a single frame render takes "days" to complete, I wonder what's in the scene, or what render settings they have to make it take so long. Please excuse my ignorance in these matters.