The opening hours for the different libraries can be found on the right hand side of the library portal page.
Please note that the opening hours are usually the same during recess week & e-learning week but shorter during the vacation periods (Dec to Jan & May to Aug). The library is usually closed on public holidays but may be open on selected holidays (during the examination period). To confirm, please refer to the NUS Libraries portal for announcements on any revision of opening hours.
Books that are already reserved and on hold for you for collection can be collected as long as the library is open.
Also note that these are for opening hours of the library premises, specific library services might end earlier. For example, loans desks in Central Library are usually closed one hour before the library is closed.
Photocopying services at the service counters timings also differ from the library opening hours.