It rendered for 9 hours because I turned it on this morning before going to work. :)

I ran a few test renders last night on the same scene getting the sun direction and camera position right and they were acceptable quality within 30 minutes.
The overexposure is on purpose, gain is already low at 0.04 but I cranked the fstop down to all the way to 0.7, exposure at 1/250, iso at 80.

Software: OS X 10.8 - Poser Pro 2012 SR2 - Luxrender 1.0RC3 - Pose2Lux
Hardware: iMac - 3.06 GHz Core2Duo - 12 GB RAM - ATI Radeon HD 4670 - 256 MB