Was there on a Thursday night, 2 lines at the door. One on each side of it. Didn't seem that long, but we were there early. I'd say hour and half but be on the safe side and schedule for 2.
If you didn't reserve a spot prior, then I'd get in line at least two hours before.
I agree with Lynn. We waited 2.5 hours. There is still no gaurentee that you will be able to get in though.
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