Time was taken with a stopwatch. Crash happens consistently after 20 minutes.
EDIT: Several attempts to reproduce the crash in other scenarios failed, seems to be exclusive to "Lunar Proving Ground"
Suspected it may have something to do with audio playing from other applications (Youtube/Firefox)or Realistic Sound Simulation, but eliminating both still produces the crash.
The base I am building is moderately sized (by my observation), with a good number of printed parts strewn about as I work on it.
Most recent crash log included.