There were 20 leap years from 1929 through 2008. (the next one is 2012):
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There have been 13 leap years since 1959. The first one occurred in 1960, and the last was 2012. A leap year occurs every four years.
Leap years occur every four years.
There are 366 days in a leap year, the extra day falls in feburary giving the month 29 days, Leap years occur every 4 years.
Although seldom seen, it could be used as an adjective (leaped obstacles, leapt obstacles).It is a verb form, the past tense and past participle of to leap and has the variant form leapt.Like many past participles, it can (rarely) be used as an adjective.
60 seconds * 6 0minutes*24 hours*29 days = 2,505,600.... According to my calculations