When do you think Tim Duncan will retire?

Do you see him playing for another 5 years? Some guys like Abdul Jabbar, Moses Malone, and Robert Parrish played for many, many years Karl Malone included. How many more years do you think Shaquille O'Neal will play or Kevin Garnett before they retire? They're all over 10 years in the NBA now Duncan with 12 years, Garnett with 14 years and Shaquille O'Neal with 17 years. However, Garnett is the youngest of them all because he got drafted out of high school remember...LOL...that puts an extra 3 years ahead of Duncan. So how many years before each one retires?