Very minor/misleading error.
I've noticed lately that my total play time has gone up a lot. I'm over 1 day so far since the public release, but I think I found out why...
The game adds your time sitting at the menu or player screen on to your next game if you don't close it. I found this out because I play a lot at work and I'll let it sit open for hours at the main menu without a game.
The quick test: Check your play time, let it sit for a few minutes, load up AoPc and set off a nuke and even though it says you only played for 10 seconds, it'll add that few minutes to your game time. Then quickly start AoPc again and nuke yourself and it will only add the few seconds since your last game.
This should probably be taken care of, just in case we add features that might use the game clock.