Since an undergraduate degree takes 3 years of not quite fulltime study, I imagine following Susan's list will take approximately half that long, since you will

Since an undergraduate degree takes 3 years of not quite fulltime study, I imagine following Susan's list will take approximately half that long, since you will not be doing any practical classes. The key word here is _study_, not reading - you must work through the exercises and get feedback on them somehow. Reading popular science books, even Penrose, is not enough to get you there. > I am interested only in the current understanding of Physics, worked starting from the laws as understood today. Sort of like what Principia Mathematica was intended to be. I do not know of an equivalent for Physics. Physics is about creating models that describe the universe, not building up a theorem from first principles. If such a thing existed (string theory maybe?) you would still need the undergraduate background to recognise the emergent behavior. Do not waste your time on the OP.