EA: The Human Story
 

Now, it seems, is the "real" crunch, the one that the producers of this title so wisely prepared their team for by running them into the ground ahead of time. The current mandatory hours are 9am to 10pm -- seven days a week -- with the occasional Saturday evening off for good behavior (at 6:30pm). This averages out to an eighty-five hour work week. Complaints that these once more extended hours combined with the team's existing fatigue would result in a greater number of mistakes made and an even greater amount of wasted energy were ignored.

http://www.livejournal.com/users/ea_spouse/

From my experience; 12 to 14 hours day only will last two weeks in any team for any emergence screw-ups or crunch time. After that, productivity would drop to below an eight hour day ..... mistakes and accidents start to occur at way above average.