The Scream by Munch can be viewed for several hours at a time. It's actually limited by efforts to conserve the painting, so the museum only expose it to light

The Scream by Munch can be viewed for several hours at a time. It's actually limited by efforts to conserve the painting, so the museum only expose it to light for a few hours per day. If you time your visit to avoid the tourist season in den Haag, I think you can also view Vermeer's Girl with a Pearl Earring for essentially as long as you like.