I did it in two days... with a total of 5 hours of sleep in total but I also took a lot of procrastination breaks >_> If you studied hardcore, you could probably do it in 12 hrs. Personally I really think it saved my butt on my final! And it's by far the best Orgo supplement I've seen.
But I had also studied pretty hard for each of my tests throughout the semester so it was more of a review. If you kept up, reading the book and doing the problems in such a short amount of time can help tremendously. But if you're relying on this to learn/understand the material for possibly the first time, 12 hrs may not be enough time. Again, this depends on how much you kept up throughout the semester, how many practice problems you've done, and how Orgo-inclined you naturally are 🙂
I also skipped the IR/NMR stuff (~50 pgs) b/c that was covered in lab and not on our class final. Since you're pressed for time, use the book to study smartly. Skip the practice problems (you can still read the sections to get a clearer understanding) for concepts you've got down pretty well and do the problems/read the sections for materials you really don't understand. Good luck!
