Went on a Saturday afternoon, arrived about 3:30pm. There is a wait, from what I understand, there's always a wait. Ours was maybe 30 minutes total from the time we walked into the building to when we walked out onto the deck.
Expect to be surrounded by people, many who don't realize how rude it is to push in line or try to cut. While waiting in line, (me, a Chicagoan, my friend, the New Yorker), we decided that in other countries they must not wait in any kind of a line EVER. It was frustrating to watch these people ignorantly push past little kids to get to the elevator first.
Once out on the deck, none of it matters. If you have any kind of appreciation for the architecture of NYC, you'll love the view. Every direction is breath-taking. Bring a good camera, and be sure to take MANY pictures.
Also recommended to either bring a New Yorker with you to point out landmarks, or pay the $10 for the audio guided tour. I was lucky enough to have my own tour guide.
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