According to the Marapets day/night cycle each day lasts 2 hours.
So, a year on Marada is roughly 15/16 days (it was closer to 15, but I decided to round up to 16, I preferred it)
16/365=5840 5840 days in a year.
I then took this number.
5.840 marayears = 1 human year
I then tested if it seemed 'sensible', by the results to me it seems so.
Note: The maths may be off, if it I apologize