Agree with Bryan. Target for morning time and there will be no waiting. We went on Saturday arround 10:30 am and there was no queue.
Tickets are purchased based on entry time. If you do not buy ahead, you may not be able to enter thr Park at the time you arrive. There is no maximum duration of stay
We went saturday morning and bought tickets with no line.
On the website, there is a place to purchase tickets but if you do it online there timed admission
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