Im buying a house so how long does Closing take?

Hi,
Im buying a house in Long Island and i would like to know how long closing takes. I will buy the house with an FHA loan. How long does closing take with popular banks (Bank of America) and nonpopular banks (Chinatrust Bank). Also how much will closing be about? (Banks are an example)
Thank You
Update: Also will the closing duration decrease because i have children who need to go to Middle School/High School and they need to be registered into the schools.
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