[Enzolangellotti]

Unless you already know the material it will require a week or more. The book is very discoursive and clear, there are plenty of exercises and examples (which I assume the author of the list didn't do). I haven't proceeded past page 30 as I'm currently learning high school mathematics and I'm not yet comfortable with integrals and the notation but I think it's a book you could easily digest once you've gotten the prerequisites.