The Kusama exhibit at the Hirshhorn was as amazing as anticipated, including the long lines to get in even with timed tickets.
The lines for each infinity room were 50-100 people long, with groups of 2-3 being let in for 25 seconds each.
At the end is the dot room, with no time limit. It originally was pure white. Each visitor is given a sheet of six colored stickers to apply, so the room will fill up over time. I went to the exhibit at the end of the second day, so there was still plenty of white space left.