From the recent Slashdot story on work attire is this post about 28-hour days:
On one of my first big projects, we ended up working so much that our “days” extended to about 28 hours. We would work for 20 hours or so, sleep 6, waste an hour or two getting to and from work and eating, showering, etc. As a result, our hours rotated and we had to distinguish between “yesterday” and “virtual yesterday.” […]
Yikes, that would just about kill me. But, it does bring a whole new meaning to the term “death march” ;).