You might consider writing to a temporary file and only when it's complete, overwrite the existing. That's how 3dsmax does it and it has saved me multiple times.
Here is a preview at one of the characters for a project I am working with a handful of friends. One 1024x1024 texture, 1,640 Polygons. Created in 3DSMax 2014 and CS6
For the use of 3dsmax probooleans and zbush here is the link http://polycount.com/discussion/168610/3ds-max-zbrush-proboolean-dynamesh-hardsurface-workflow-tutorial/p1
@kanga Thanks! That rimming around her eyes is a placeholder for her eyelashes. I normally don't sculpt the finished eyelashes; I create them in 3dsmax.