just a tip, certainly for "long renders"

if during the precalculation, you see "highlighted area's".
You will get too much reflection in the final render on those spots.
bright to bright orange. . . .
Armpits are prone to this.
Or any other  "close together area".

Reduce the Diffuse setting to .8 on the texture can help.
Or play with the amount of light you are giving. . 

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!