If the game speed is changed using + or -, the new
game timer will speed up or slow down accordingly. The game duration displayed at the game results screen (and also on play.mg -- test with a single-player network game) does not take into account game speed changes.
To reproduce:
Start a new game. Press + until the game is running at 8x, and wait for some time. Pause the game, noting the displayed game time (if on git head), then quit, and note that the time on the results is different.