Depending on the complexity of the request, it may take several minutes to a maximum of 7 days to resolve. Answers to specific questions related to: library collections and access to documents or scientific databases, the library program and how to register, the provision of titles of documents, etc., addressed directly or by telephone, take a maximum of 5 minutes. On-demand bibliographies or complex bibliographic searches may take between 3 and 7 days, with the possibility of extending this period, in certain cases.