I think he said only the lightmaps were pre-rendered and that took 10mins. The actual scene runs real-time at 50-60 fps on his gtx670. (Prerendering lightmaps

I think he said only the lightmaps were pre-rendered and that took 10mins. The actual scene runs real-time at 50-60 fps on his gtx670. (Prerendering lightmaps is typical for games for scenes with static lighting.)