Voyage to A. Centauri

The spacecraft Voyager was launched from Earth 35 years ago (as of 9/5/12) and is at what is considered the outer cusp of our solar system, having travelled 11.3 billion miles. Alpha Centauri, the nearest star to our sun, is 4.37 light-years away. How long would it take Voyager to reach Alpha Centauri at the rate it is traveling? (Assuming it were pointed in that direction.)