You'd be surprised how much can change in 30-day period. Like, for instance, Katie Couric's strict "No Paris Hilton" policy, which lasted approximately just under one month.

As TVNewser points out, both CBS and ABC devoted time to Paris Hilton's early release, with only NBC abstaining.

On the plus side, however, Couric has proved more successful at adhering to other, lesser known policies—such as the time-honored "Third Place Finish" tradition.