Tickets are valid through 5pm on the date of your visit, regardless of entry time. Most people spend 2-3 hours but many stay most of the day and some pass through more quickly. Tickets specific for special programs after hours are valid during the event itself, like Fernbank After Dark, which is from 7:30pm-11pm for ages 21+ only. Hope to see you soon! (sorry, but wrote this earlier and forgot to hit the "post" button. :)
All day I think but it doesn't take long to do the whole place
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