If your asking how long the day is, then it is 16.11hr., if your asking the length of the year, then 60190 days.
60,190.03 Earth days (164.79 Earth years) (89,666 Neptune days)
Neptune orbits the sun, not Earth. Its orbital period is 60,182 Earth days, or about 165 Earth years.
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The rotation of the planet Neptune is much faster than Earth's. It completes a rotational "day" in about 16 Earth hours. So in an Earth year (365.25 Earth days), Neptune completes about 544 Neptune days. In a Neptune year, there are about 89,666 Neptune days.
One orbit for Neptune takes nearly 165 Earth years (164.79 years). This is approximately 60,190 Earth days. But a day (complete rotation) for Neptune is much shorter than Earth's, about 16 Earth hours. So there are about 89,666 "Neptune days" in a "Neptune year".
60225 earth days = one year on Neptune
It would take over 16,000 Earth days, or around 44 Earth years, for a spacecraft to travel from Earth to Neptune at its average distance from Earth. The actual time would depend on the speed and trajectory of the spacecraft.
16 hours or 0.67125 earth days
It takes roughly 6.4 Earth days for Neptune to rotate on it's axis.
I'm not sure how many days in one of Neptune years but one of Neptune's days is 16 hours and 7 minutes long. And one year is 165 earth years so 365 x 165 = 60225 earth days in one Neptune year.
60,182 earth days.
it's actually 1 sec on earth