Original sentence: Auckland-based production company New Upstairs Productions said filming would run for 30-40 days from January 28 to April 18, 2008 with no filming in weekends.The film  grossed $8 million and opened at number five in the box office in it's opening weekend
Edited sentence: Auckland-based production company New Upstairs Productions said filming would run for 30–40 days from January 28 to April 18, 2008 with no filming in weekends.The film  grossed $8 million and opened at number five in the box office in its opening weekend