Based on my experience, the waits can be long. So check the Chamber first when you arrive--it's down the hall to the right once you enter the Cohen exhibit. If the line is long, check back later--but if there are just three or four folks ahead of you, go ahead and sign in. The wait time is about five minutes per person.
There are guides at the entrance of the chamber. They schedule you on a tablet, I waited about 10 minutes and that was early during the exhibit. The chamber is eerily beautiful
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