The time on the tickets is designated for checking in or even getting in at that time if the line is short. In terms of the walk around in the thrill park itself, shouldn't take more than 2 hours, but my group took an hour and 20 minutes for all of them. It depends on how fast you get done and how long lines are.
The time on the ticket is the check in for a time slot. Total walk through the event was about 2 hours including line wait.
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