a day is 256 earth days
so times that by 30
is 30x256=7680
so about 7680 days
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Neptune probably doesn't have months. A day is how long the planet takes to spin on it's axis and a year is how long it takes to go around the sun, but since these times are completely different on other planets, and there is no one there to decide that there will be a certain number of months per year and that they are a certain number of days long each...then there are only days and years on other planets.....
I suppose you mean "neptunian day" and "neptunian month". How would you define a "neptunian month"? A day is easily defined by the rotation. On Earth, a month was originally defined by the movement of the Moon, but Neptune has several moons, with different periods.
Neptune has 16 hours and 6.7 minutes in a day. However, as it takes approximately 165 Earth years to orbit the sun, Neptune doesn't have traditional months like we do on Earth.
The year length is 165 years on earth. and the days there are 16 hours for us. I'll let you do the math.
Neptune takes about 165 Earth years to orbit the Sun. That's one Neptune "year" of course. Neptune's "day" is about 16 hours and 6 minutes ( 16.1 hours). That's the time it takes to spin on its axis once. From that you can work out how many Neptune days the orbit takes, if you want. I make it to be about 89838 "Neptune days". You can say Neptune "year" and Neptune "day", but the terms "week" and "month" are normally only used for planet Earth. Also when I've used "hour" in this answer I mean an Earth hour. This is normal in books on astronomy.
It takes roughly 6.4 Earth days for Neptune to rotate on it's axis.
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.
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Neptune takes about 16 hours (0.67 Earth days) to rotate once on its axis.