Yes the tickets are timed. Buy them online in advance. Line moves quickly. You'll go through a screening like at the airport.
They are not timed. The line is long but moves quickly if you get them online. You can but tickets there as well
Its a long waiting in the queue so plan your trip for all day
I stood in line. It is roughly about 3 hours to go through everything. Plan your day well in advance and make allowances for delays
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