Suppose we have a bond with a coupon rate of 8.5%, 5 years to maturity, and $100 par. Assume the bond is trading at a yield of 6.6% and coupons are paid semi-annually. Assume semi-annual compounding. What is this bonds Modified Duration in years?

Round your answer to 2 decimal places. For example, if your answer is 25.689, please write down 25.69.