When the National Museum of African American History and Culture opened in September, Associate Director Beverly Morgan-Welch expected a lot of visitors.
But she didn't expect how long people would stay once they got in. Museum experts call that "dwell time."
"The normal dwell time for most museums is an hour 45 minutes to two hours," says Morgan-Welch. "Our dwell time can go to six."
With visitors staying six hours, it's impossible for the museum to let in more people. And since passes are sold out until spring, people can't just stay for a couple of hours and come back the next day.
"It's the best, most difficult problem I've ever faced in a museum," Morgan-Welch says with a laugh.