It varies depending on the popularity of the movies and availability of the film. Generally they change ones of the three times every week, usually resulting in a new set of movies wheel other weekend.
Varies by popularity. 4 weeks is usually the longest
The last 2 weeks were the same 3, this week is 2 of the same with a different 3rd. I know Avengers will carry through to at least Memorial Day weekend.
Usually about a month
It varies
They normally change already one of the movies a week it all depends tho
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