Matt Damon told Variety‘s Marc Malkin Monday night that Christopher Nolan’s “Oppenheimer” runs a hefty three hours long. On the red carpet for “Air,” in which he co-stars, Damon also talked about Nolan’s upcoming historic drama in which he appears alongside Cillian Murphy. “It’s three hours. It’s fantastic,” Damon said, revealing that he’s seen “Oppenheimer.” […]