Movies normally start around 1pm and latest around 9:30-10p.m. yes it is only open to guest with tickets at the ticket counter is on the 1st level and you need a ticket to go upstairs.
Showtimes vary on the week, but in general, theatres unlock doors 30 minutes before the first showtime and lock them 15 min after the last. Check amctheatres.com for the latest info on showtimes
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