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In a milenium there are none.

However, in a millennium, there are approximately31,557,600,000 (32.6 billion) of them. The exact number will depend on the number of leap seconds.

Between 1972 and 2012 a leap second has been inserted about every 18 months on average. However, unlike leap days which appear every fourth year (with an adjustment for Century years), leap seconds are not spaced evenly. There were 9 leap seconds in the 8-year period 1972-1979 but none in the 7-year period covering 1999 to 2005 (both inclusive).

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12y ago

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