To save power, the computer goes to sleep after a short period of inactivity.
I set: Never (PC) and Never (Disk)
but for some
unspecified reason, and so again changes, eg. for 2 hours or less

Simply prevents computer from going into standby or sleep mode to keep
Repair Active !!!

Prevent standby/sleep when Tweaking Windows Repair Start RepairStarting Repairs...
Started at (20-04-16 10:08:58)
Unhide Non System Files
Start (20-04-16 10:08:59)
W:\ - Total Files Unhidden: 0 out of 397483300 searched. - Check Unhidden_Files.txt for list of files unhidden
Done (20-04-16 10:32:03)
Cleaning up empty logs...
All Selected Repairs Done.
Done at (20-04-16 10:32:03)
Total Repair Time: 00:23:06
...YOU MUST RESTART YOUR SYSTEM...