Not quite half res test render

There is so much stuff in Maya that you learn something new every day. You can test render at half resolution by selecting Rendering → Render → Test Resolution → 50% Settings. Real handy. So why does the batch render of the entire scene is still take more than 12 hours? The batch rendered at full res. Here is an image from last nights render (if you click on it you can see it bigger but scaled down to half res).

All progress is slow. But we should hit the next dimension in about a week.