the rendering of each picture (for this room) lasts an average of 26 hours +- depending on the models in the frame. Quality 2000x1500. Intel(R) Core 3.40GHz processor 8.00 GB x64 RAM. I realized that YafaRay is simply a record holder both in terms of processing capabilities and speed. Sunflow is even afraid to guess how much time is needed. Probably a week.