second = 9.19 billion oscillations of a cesium 133 atom

 minute = 60 seconds

   hour = 3,600 seconds

    day = 86,400 seconds

   week = 604,800 seconds

  month = 18,144,000 seconds

   year = 31,556,926 seconds

 decade = 315,569,260 seconds

century = 3,155,692,600 seconds

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