Another question that Randy Hunter has heard from many saxophone students is about how long it will take to get good at playing saxophone. Randy teaches sax at Emory University, he has written books and lessons specifically for beginning sax players. His lessons and books are available through Sax Station-Beginning Sax Lessons
This question is relative to your expectations and practice commitment. First, you should realize that you will be a sax player for life. The most enjoyable part of playing sax is the journey. You can excel and improve for the rest of your life.