Sidereal rotation period is approximately one Neptunian day, time taken to rotate once on its axis. This is 0.67 days or 16h 6min 36sec.
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One day on Neptune is about 16 hours and 6 minutes, while one year on Neptune is about 165 Earth years. Neptune's slow rotation and long orbit around the sun contribute to these unique time frames.
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.
There are about 0.6713 Earth days or about 16 hours, 6 minutes, 36 seconds in a day on Neptune. (see related link on Neptune)16.11 Earth hours
A day on Neptune, from one sunrise to the next, lasts about 16 hours and 6 minutes.
On Neptune, a day is about 16 Earth hours and 6 Earth minutes long. Neptune has a much longer day than Earth due to its slow rotation, which results in a longer day-night cycle on the planet.