I am on a G3 iMac with 160real ram/240virtual and had one that took close to 3 days. It's in the gallery and called "The Arrival". It was 16x12 at 72 DPI and had a few volumetrics in it. Some artists have been known to set up a render and go on vacation. However, Bryce can be comparitively slow sometimes, but it does do beautiful renders, and with the price it can not be beat