24 business hours - comes from PJ Comics. regarding the forthcoming indictment of Carl Rove. First reports from DU were Rove would be indited in 24 hours after that time had elapsed, they changed it to 24 business hours. (thanks, mwave)
PJ-Comix
Karl Rove
Indicted
And technically the reports were that Rove had been indicted, and had 24 hours to arrange his affairs before it would be made public.