Definitely doable. This summer I went from a 18 to a 1.3 in 5 months. It took me around 10 hrs of golf a day, so if you can devote 3-4 hrs a day you should be good (especially if you don't play rounds). Try to be honest about how good parts of your game are. I seperated my shots into 4 categories (drives, approaches, short game, putts) and give each shot a score 1-10 on each hole, then use that to dictate the practice for the next couple of days.