Langsam Library’s 5th and 6th Floors Open 24/7 This Week Posted on December 5, 2016 by Melissa Cox Norris Need a place to study for exams? In addition to the 4th floor, which is always open, the 5th and 6th floors of Langsam Library are also open 24/7 now until 6pm on Friday, December 9. Share on FacebookTweetFollow us Related posts: Labor Day Library Hours Study 24/7 in Langsam Library Starting Nov. 29 UC Libraries Closed Thanksgiving Fuel Your Late-Night Studying in Langsam with Coffee and Snacks.