That's it. It's set to 8 right now. Per some googling, apparently 2 (seconds) is the default. Thanks for the help.
When I ran the GPU stability test for the first time, AIDA64 warned me that I should increase (or decrease?) some threshold or time setting for graphics driver responsiveness. I said ok, make the change. Whatever this feature was called - I can't recall, how do I reverse the change? I want to troubleshoot some video problems that have been occurring since I made that change.