Will any library be open for twenty four hours during reading period and / or finals week?
If not, I highly suggest the administration work on making that happen. How does the school expect students to prepare for all finals in a two day reading period when closed libraries will force us to waste time finding appropriate places to work? It's already frustrating during the quarter.
The Suggestions Office suspects the University administration would be unsympathetic to your pleas.
That said, here is a summary of Library hours for reading period and finals:
Regenstein A-Level: the A-Level will be open 24/7 beginning Sunday Dec 29 through Friday Dec 11. That includes Friday Dec 4 and Saturday Dec 5.
Rest of the Reg: will be open normal hours (i.e., until 1 a.m. Sunday - Thursday and 10 p.m. Friday-Saturday)
Crerar, Eckhart, SSA: all keeping their normal hours. (UPDATE: The Crerar folks tell me they will be open until 1am this Friday and Saturday.)
Harper: It's not a library anymore, but the Harper Commons will keep it's normal hours and be open 24 hours EXCEPT for Friday Dec 4 (closing at 6pm) and Saturday Dec 5 (closing at 10pm).
Law: Law will keep its normal hours, but it is highly likely the Law School will restrict building access will be restricted to Law students or those using the DLL collections during reading period and finals. If you are an undergrad living in BJ or South Campus, start making plans to go to Harper. (UPDATE: Lo, the restriction has come to pass -- starting Friday, December 4.)
Full hours information is available at: http://hours.lib.uchicago.edu/
Note that the Library completely controls the hours of Regenstein and Crerar only. In all other buildings, the appropriate department/school sets building hours. So if the department decides to close early or to restrict access to its own students (cf. Law), the Library has to abide by that decision. We can be more restrictive, but not more permissive.