So far my renders are 10 mins for something simple to about an hour and a half for something like that. I would hate to wait as long as you are for a render. Just saw your spec's, it's mostly that GPU that is killing you. I have close to the same setup, well i have a 6core i7@3.4GHz 16GB RAM and a Nvidia GTX 1080. I am pretty sure i will just build a new computer if i actually stick to doing this kinda stuff. Mine was built almost 5 years ago now, I would normally upgrade the video card at this point and use the computer for another 3-5 years. But those Ryzen chips are looking awesome, so i might as well just build a whole new system and call it a day. You know if i can get everything for a normal price that is.