Scientists, professionals, teachers, industrialists etc all over the world are engaged in research to find solution for many existing problems. The results of these researches published in many forms. The outcome of one's research become the input for other scientists. It is observed that there is time lag in the publication of information to its use. It is the responsibility of libraries to reduce the gap between information and users. Therefore, the researcher has decided to study the time lag between these two poles when books reached to the end users through the library. For calculating the time required during the flow of information between books to user through library, the researcher has identified four phases as. 1) Time lag between year of publication of books to the date on which it received to the library. 2) Time lag between books received to the library to processed date of books. 3) Time lag between date on which books received to the library to the books issued first time to users. 4) The time lag between year of publication of books to the books issued first time to users.