If their sun had a similar luminescence then of course Ocampa would be a similar distance from the sun and therefore take almost the same time to travel around said sun as Earth around its own sun... Otherwise the planet would be uninhabitable with out teraforming and constant maintenance.
But I would assume that the universal translator converts measurements in time and space for the many people aboard our favorite starship so that they seem to mean the same distances and times.
Very true GG (great avatar, I loved the JLI!

Plus, we saw Kes age over a few years in Before and After and in Fury.