16.11 hours, approx.
628 days.
It takes 25 days to rotate at the equator and 36 days to rotate at the poles.
Have no idea.
About 25.9 hours.
27.32 days -
I believe it is 88 days.
687 days
It takes roughly 6.4 Earth days for Neptune to rotate on it's axis.
About 27.3 days.
365 1/4 days a year
234 years
153.3 hours