duration vs millennium

duration

noun
  • An amount of time or a particular time interval. 

  • The time taken for the current situation to end, especially the current war 

  • A measure of the sensitivity of the price of a financial asset to changes in interest rates, computed for a simple bond as a weighted average of the maturities of the interest and principal payments associated with it. 

millennium

noun
  • A period of time consisting of one thousand years. 

  • A period of universal happiness, peace or prosperity; a utopia. 

  • The period of one thousand years during which Christ will reign on earth (according to Millenarianist interpretations). 

  • The year in which one period of one thousand years ends and another begins, especially the year 2000. 

How often have the words duration and millennium occurred in a corpus of books? (source: Google Ngram Viewer )