Sponsors. Money. If they could sell it for 12 hours, that's what they'd do.
Are you saying there's more money to go around for college than professional sports when it comes to radio advertising?
No this is not a special event, they do this for every game. I have no idea how much they do postgame. Are you saying there's more money to go around for college than professional sports when it comes to radio advertising? If not, then why don't you see hours and hours of pregame coverage for pro sports teams?
New England Patriots pregame and postgame run 2 hours both ways, I think. Again, it's advertisers hitting a demographic target that doesn't use radio much for anything but sports and sports talk right between the eyes.