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One year on Neptune is equal to around 165 Earth years or 60,190 Earth days, which is the amount of time it takes the planet to complete its orbit around the sun. Days on Neptune last about 16 hours,... One year on Neptune is equal to around 165 Earth years or 60,190 Earth days, which is the amount of time it takes the planet to complete its orbit around the sun.
Answers. Best Answer: The sidereal (sr) rotation period is 16 hours, 6 minutes and 36 seconds. That's how long it takes to rotate relative to the stars. Since the Neptune year is 60,190 earth days, you need to figure out how many Neptune sidereal days that is. (Answer: 89,669 Nep. sr days). Then figure out what time period is 1/ 89,669 of a Nepture sr day. (Answer: 0.65 seconds).