Average Treasury bond maturities reached a low of 50 months in 2009. They’ve since been lengthened a bit to 62 months, but that still leaves the U.S. Treasury with a major refinancing risk. The Treasury will have to refinance some $2 trillion of outstanding debt in the next year – and that’s in addition to the $1.5 trillion of new debt it’s going to have to issue in that time.
That doesn’t leave much room to maneuver if markets get sticky. It also leaves a serious potential budget hole.