Hi Germán and thanks for the question. The idea of quickly is not about the time in which you can read the book. As a software developer, I learned that the estimations should never be done in time but in complexity. For some readers reading Spring Quickly might take one week while for others it might take 6 months. It really depends on the reader. Now, the idea of "quickly" in Spring Quickly and what I guarantee you is that you will learn for the beginners step by step only what you need to get into working with production-ready apps. So it is the quickest path to achieve this goal starting from zero.