Corrected entry: After Riddick has shaved his head, it is baby smooth, no stubble to be seen, but approximately 30 minutes later, he has stubble on his head and face, and as the film progresses (over a timespan of just a few hours), there's lots more stubble, lots more.
kh1616
26th Aug 2014
Correction: It's called a five o'clock shadow for a reason. The stubble comes in fairly quickly. Not to mention the fact that Riddick is a Furyan, not an Earthling, and therefore his rate of hair growth is completely unknown.
Phixius ★