1) If you have a BS in physics, what is the minimum amount of time to get a PhD in physics? Typically, is it best to get it done quickly or take your time with it, maybe getting your masters first? Also, if I don't want to become a professor, is it really worth me getting? 2) I want to get in to watching Leonard Susskind's lectures from Stanford (on iTunes U), but I am wondering what order I should watch the different classes in, if it matters. Here is the list of courses: -Classical Mechanics -Cosmology -Einstein's Theory -Quantum Mechanics -Special Relativity -Statistical Mechanics -Modern Theoretical Physics -New Revolutions in Particle Physics: Basic Concepts -String Theory and M-Theory -Supersymmetry, Grand unification, and String Theory -Topics in String Theory When would these courses usually be taken for someone? Like 4th year undergrad? Also, what topics should be known before watching these? Thanks a lot!