I have a feeling Morphy knew more about chess than he ever had the opportunity to show in his games. You wouldn't be as good as Morphy by only studying his games. You'd have to know what he knew that he never played as well.
I suggest reading by candle light only chess books published pre-1850, and then studying Morphy's games after.
Good luck.
A lot. He was a great tactician even in today's standards. The problem is mainly a lack of opposition, there aren't that many games he played that requires study since there weren't more than 10 players that could have a decent match against him, matches where he could show his real talents. Therefore 6 months is too much in my opinion. You should check out my blog, I am doing a series on Paul Morphy! :)
How much do you guys think can be learned about chess just by studying Paul Morphy? If I studied nothing but his games for the next six months how good do you think one could get? What weaknesses does Paul Morphy have compared to today's players? How much could the average chessplayer learn from the American Genius?