My study start from late of Dec/2013, after about 6 months study in HeadFirst 2nd, PMBOK and Rita Exam Prep
1. 3 month study in casual (few days a week, 1-2 hours per days)
2. 3 month study in serious (5 days a week and 4-5 hour per days)

Actually, my parent language is traditional Chinese, reading the PMBOK and Rita is quite tough.
I know the meaning but have times to think about it.