As an experiment I scaled up Andy 600 times. That makes him over 1km in size. Laid him down on his back, set the camera (yawn at 12000) to see the whole body and rendered.

The entire figure was rended. I then increased the size to 10 times that (10km) and the clipping started to occur. I also got opengl issues at that point. After doing some more experiments, it looks like the limit is somewhere between 2 and 3 km.