When I was single and only seeing my girl on weekends (we live in different cities) I can go up to 12 hours on my off day nights (those time on MTW).

Nowadays on my off day / leave I sometimes play the whole day sin morning until my wife comes home (if she's working) though not all the time facing the monitor. Sometimes when I'm defending and AI stupid enough to attack me on the bridge , I just set up my army , run the game and go have lunch or whatever. After half an hour or so , I come back to the pc and see message 'do you continue' or 'end the game as all the enemies are routing.. Eheh..

Cheers...