There were 15 leap years in that period:
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Jupiter does not have leap years like Earth does, as it takes around 12 Earth years to orbit the Sun once. Instead, a year on Jupiter is equivalent to approximately 11.8 Earth years.
As of and including 2012, there have been twelve leap years since 1966. Simply taking the number of elapsed years and dividing by four will only get you the correct answer part of the time, since it mathematically assumes the year before you start counting is a leap year.
Look for a perpetual calendar on the Net, that should help. You would think there would be 25 but I am not sure they didn't skip a leap year in the year 2000 (which was the final year of the 20th century, not the first of the current one).
if no leap years: 52.56 minutes if all leap years: 52.704 minutes if standard century: 52.59492 minutes
16 years is equivalent to 5,840 days when considering non-leap years.