Batman grossed $2.2 million in late night previews on June 22, 1989 on 1,215 screens and grossed $40.49 million in 2,194 theaters during its opening weekend. This broke the opening weekend record, set by Ghostbusters II one week earlier, with $29.4 million. Batman became the fastest film to earn $100 million, reaching it in 11 days (10 days plus late night previews), The film closed on December 14, 1989, with a final gross $251.2 million in North America and $160.15 million internationally, totaling $411.35 million. and was the highest grossing List of films based on DC Comics until 2008s The Dark Knight (film). The films gross is the 66th highest ever in North American ranks. Although Indiana Jones and the Last Crusade made the most money worldwide in 1989, Batman was able to beat The Last Crusade in North America, and made a further $150 million in home video sales. Box Office Mojo estimates that the film sold more than 60 million tickets in the US.
Question: How many months after Batman opened did it close?
Answer: 6