Library hours vary, depending on the university and the time of year, but they may open from 8 to close at midnight on weekdays, and also be open for about 10-12 hours on weekends. Libraries are open every day when classes are in session, and, at a large university, even during vacations. Many students have to spend long hours studying in the library, whether they want or not. Most larger universities have a main library and smaller, more specialized branch libraries. The branch libraries have books and other materials on certain fields, for example, science or law, materials in foreign languages, or materials on a certain region, for example, East Asia.
Most students use the main library for their studies.
Usually branch libraries are open for longer hours than the main library. Here you can find professional journals related to your field. You can also find newspapers from different parts of the US and sometimes from other countries. In addition to books and periodicals, university libraries often have specialized materials. Some libraries have collections of maps from all over the world.