Zack Sharf When Matt Reeves’ “The Batman” opens in theaters March 4, comic book movie fans will get to spend nearly three hours in Gotham City and Robert Pattinson’s Caped Crusader.The official runtime for “The Batman” is a whopping two hours and 47 minutes without end credits, Variety has confirmed with a source close to the film. At 167 minutes without credits, “The Batman” is set to be one of the longest comic book tentpoles ever.