 Hart is the highest-grossing comedian today. He sells out arenas around the world and the occasional football stadium. We sold a football stadium out tonight, so I need to hear that. The wall is full of great comedians. When we first met him in January at his offices in Los Angeles, he was working on new material for an upcoming comedy tour. To do an hour comedy special, how long does it take? You need to really work on a set eight to nine months.