call them up and see if they have a set release period, or if they will just screen it until it is no longer getting in enough people. Consider though that when Harry Potter is released, it may replace TFs completely to capitalise on as many sessions of that movie as possible.
But for now, they still have about 3 sessions a day this week, and 4 this Saturday - so looks like it is still popular enough to be there for a few weeks at least.