The library is challenging patrons to read 10 hours for children or 10 books for adults from June 2 through July 12. The youth department rewards young readers with prizes at each hour mark and, for those students who complete all 10 hours, will host a Twilight Swim finale from 6:45 to 8:30 pm on July 14 at Meridian Park Family Aquatic Center, 101 McKinley St.