About 25.9 hours.
Eris takes approximately 550 Earth years to rotate on its axis.
The word is "revolve" or "orbit", not "rotate". It takes Eris 560 years to orbit the Sun once.
Eris takes about 25.9 hours to complete one full rotation on its axis.
202887.25
628 days.
It takes 25 days to rotate at the equator and 36 days to rotate at the poles.
25.9±0.5 hr, according to the Wikipedia article.
Have no idea.
27.32 days -
203,830 days.
I believe it is 88 days.
687 days