28 days, but to be exact 27.321582 days
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the orbital period of Saturn in earth years are 89years
The answer depends on what the ordinality is based on: distance from the sun/orbital period distance from the earth brightness in our night sky size/mass number of moons when discovered when visited (fly past) by a spacecraft Each one of these will probably generate a different ordinal number.
That appears to the orbital period of Earth around the Sun, but I think the digits past 365.25 are not correct.
It's a shorter way of saying "menstrual period" as opposed to other kinds of periods, such as orbital periods, periods of time, etc. The etymology of the word is something along the lines of "Interval, season, time, circuit" etc.
270 days = 0.73973 ordinary calendar year 0.72770 calendar leap year 0.73924 earth orbital period