19:29 And so because of that one thing… when the flights were coming in for the Towers… it was on radar… they knew it… they were scrambling trying to get somebody up there to deal with it… and Cheney blocked it every single time… they called him 3 times and he blocked it, he blocked it, he blocked it… they told him if you don't do it now it will be hopeless and he said, go ahead… and they scrambled them but by the time they got up there… it was too late…