Tabsina, you can check which days you played, so if you don't play every day, you are much better prepared that way.
For me, this is a rough estimation from what the games say.
The godfather: 120 hours.
tLoZ: TP: 110 hours.
Super Mario Galaxy: 40 hours
Wii sports: About 30 hours.
Wii play: 19.5 hours.
Re4: 10 hours.
Tiger Woods Pga tour 2007: 10 hours.
Total: 340 hours. Since may that is. So 37 hours a month, or a little more than an hour a day. Even though I think I overestimated a bit, due to letting the game stay on (For TG:B that is at least 30 hours) so I'd say 50 minutes a day.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS







