Day admission only has to leave between 5-7, as the haunted houses start at 7:30. Basically, the park closes for day admission at 5, unless you want to do shopping & picture things on your way out "Howl-O-Scream entry begins at 5:00 p.m. every event night, with haunted houses opening at 7:30 p.m." with a 'happy hour in the cheetah hunt plaza beginning at 5. If you have a day pass & howl-o-scream ticket, you won't have to leave, but similar to Halloween Horror Nights, might have 'a holding area 'unless you're good at 'hiding in the park', Day admission & season passes DO NOT WORK for this event, though I believe seasonal pass holders get a discounted admission price. Sign up for some of the Orlando Insider events, those are pretty cool to try. Same kind of thing but limited admission, unlimited food & beverage, typically around a themed holiday time of year, like Christmas or spring & can be at Universal or Disney, haven't seen one at Busch gardens yet, maybe they'll do one soon.
Between 5 and 6 pm. The event starts at 7:30pm
I think they try to get everyone out during the down time if I remember
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