 The duration is an average time that it takes to get all of your money back, not just the principal, but the interest as well. So you're receiving interest in year one. You're receiving interest in year two, right? So the time that it takes to get back all of your money is actually a little less than the maturity. The duration is always going to be a little less than maturity. But the duration is also a good measurement of the price sensitivity to interest rates.