How long will it take to speak pretty darn good in french if I learn from a book rather than teacher?

It is difficult to say exactly how long it will take to speak "pretty darn good" in French if you learn from a book rather than a teacher, as it depends on a number of factors, including your natural language learning aptitude, the amount of time and effort you put into studying, and the quality of the book you use.

Here is a general guide:

- Basic Conversational Level (A2): With consistent and focused study (approximately 3-4 hours per day), you can reach a basic conversational level in French in 6-9 months if you use a well-structured book and supplement your learning with additional materials such as audio recordings, online resources, and language exchange partners.

- Intermediate Level (B2): To reach an intermediate level, where you can hold conversations on a wider range of topics with relative ease, it may take approximately 12-18 months of focused study if you build upon your basic knowledge and continue using a combination of resources including textbooks, online courses, and immersive experiences.

- Advanced Level (C1): Reaching an advanced level, where you can express yourself fluently and engage in complex discussions on a variety of subjects, requires substantial time and effort. With continued focused study and practice, it may take around 2-3 years to reach this level using textbooks and self-study materials.

Please keep in mind that these timelines are approximate and can vary greatly depending on individual circumstances and learning styles. Learning from a teacher or taking a structured language course may provide additional support and guidance, potentially accelerating your progress. Additionally, immersing yourself in the language through travel, language exchange partners, or cultural experiences can greatly enhance your learning and fluency.