As the comments in the original article state, the Airbook was hacked 2 mins into the <i>second</i> day. So it was 24hrs + 2 mins = 1,442 mins.<p>And the rules are:
1st day: only network vulnerabilities (and a $20,000 prize)
2nd day: WWW attacks opened up (essentially changed from OS network security to browser security.) Safari fell to a javascript vulnerability (i think). The dude won $10,000 for that.
3rd day: Applications get to be installed.