1. that is why it is called one year.
It takes about 50 years from earth to Pluto
Mercury's orbit of the sun take 88 Earth days so 0.24 Earth years
1
50 Earth Years and 1059 alien years.
lots
It takes 29.5 Earth Years
165 Earth Years
1, it's why we have years
10000 years
4 years
1,000,000,000.543 years from Earth
By definition, one.