I realized I did not take 6 to 7 weeks. (probably because I was in the airport jetlagged and half asleep). I took a good 11 to 12 weeks. I had a busy work schedule, so I ended up spending 3 to 4 hours per workday and 6 to 7 hours on weekends. Not sure if there is a way to edit my original post and change the time taken. I have made my notecard public (AWS CSA Study Notes). I also reviewed other public notecards. Notecards are very helpful.