A dumb question - isn't the GDP a per-year figure whereas the debt a total figure? ... so doesn't it simply mean that if all GDP goes to paying off the debt, it

A dumb question - isn't the GDP a per-year figure whereas the debt a total figure? ... so doesn't it simply mean that if all GDP goes to paying off the debt, it will necessarily take more than 1 year. That pay off period is increasing and about to cross the 1 year threshold, but I'm not getting the "debt cycle" concept .. in other words what is the difference between 1year-delta and 1year+delta?