It entirely depends upon your reading style, reading strategy and circumstances. I considered Level I as an experience and it took me 14 weeks to complete the syllabus and 3 weeks to revise and appear in the exams and I was able to pass the exam in June 2011 without finance background. It isn’t about luck I can quote hundreds of examples who passed like this! Level 1 is relatively less about understanding and more about retaining! Generally it is assumed that one can do Level I in 6 months but like I already mentioned a lot of variables govern your ability to pass, of course including time!
As far as the study methodology is concerned Shweser is fine, I used it and it helped me out a lot. Portion a part from GIPS in Ethics (The 7 standards), I’d recommend you to study from CFAI Text books and while you are giving the first reading make sure you make bullet points and structure your material in a way that it would be easier for you to revise it. Apart from Mocks, the least which you should do are the CFAI text books End of Chapter questions. They are proxy to the exam questions and will give you a reasonable idea of the exam. Stay focused, enjoy your quest and make your journey memorable. Good Luck