Although the 10 year has finally hit 3% here in September of 2018, stretching out on the yield curve provides little benefit as the 30 year is yielding only about 3.2%. Since the risk premium for the 30 year is not there, keep your bond duration low and pick up the higher yields when your bonds mature (think laddering your bonds). Notably, Vanguard still believes that global fixed income returns will be in the 2% to 3% range for the next decade.