If you go online and book the 10:00 am entry time, you will go in immediately with no other reservation. Otherwise, you have to reserve a time after you enter the museum and it can take some time.
they take your phone nr and give u a text message for when u can go to the line for the room if there is many ppl there. When I got in the line after the text it was about 10 min
The wait time depends on the crowd but make sure you sign up as soon as you get in the building. The signup system will close after the reservation for the day is full.
Go early and get your ticket there for the same day
That depends, with SMS reservations not much as 20 min. Without you will have to wait more longer
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