Takes about 60-90 mins
Can you please be more specific? Are you asking for a minimum time for a visit? (I.e. how long it would take just to enter, with lines for admission and security...) Are you asking if availability is limited and how much time to get tickets in advance for best results?
You don't need to plan anything you walk in and buy your tickets best time to go is 9 a.m to 10 am
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