26. (15 pts) You are a financial advisor who specializes in fixed income assets. Your client has a large investment in one single bond securities, and is worried about interest rate risk, given the high inflation of 6%. The bond has a $ 1,000 par value, 6% annual coupon bond that mature in 5 years. Assume that market interest rate is 8%. Can you suggest your client an investment horizon that could protect the value of his/her bond asset from interest rate changes? Round to 2 decimal places.