I started this book my senior year of high school and just finished it halfway through my first semester of college. Needless to say, it is a long read.
It is incredibly interesting, though. I learned lots of new subjects in much more depth than I am used to from other textbooks, and this textbook really did challenge me to think at a higher level. It is quite a step up even from Basic Algebra I.
I really appreciate that Jacobson gives historical context in the development the ideas that he presents, and the exercises make me feel like I am actually participating in the development of these ideas.