User blog comment:Klau001/I was watching s6 and got the though how many years passed since they first got sent to the ground. Like, how long they lived on Earth before they got in cryo sleep? Anyone followed the time passing?/@comment-40193977-20190809060042

In an interview Jason Rothenberg explains that there is a staff member who has the duty to track about the time passed. Like counting sun rise, or how many times there was 'dinner' at the show.

With this basic information Jason Rothenberg is able to answer some fan questions.

Partly Jason Rothenberg gives such answers - but all spread in different interviews.