As least 11 but no more than 13 leap years occur in 50 years.
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1577880000000 milliseconds approx. The exact value depends on how many leap years there were in the interval and on whether or not there were any leap seconds.
2609 weeks.
18261 to 18263, depending on the leap years.
82 years and 50 days or 49 days depending on if it was a leap year
28261, 28262 or 28263 depending on (a) when you start and (b) whether or not you have a year that is divisible by 4 but not a leap year eg 1700, 1800, 1900, 2100 etc.