Light years is a unit of distance, not time.
You don't say how long is 12 miles. That's how long they were asleep. (well, except in a very metaphoric way.)
They supposedly traveled to a system 30 light years from earth (like New York is roughly 3000 miles from LA). How long it took to travel that 30 light years would vary depending on how fast the ship was going. Minimally, 30 years if they were traveling at the speed of light; which is unlikely in the extreme. With current technologies, thousands of years.
Now, since the ship somehow returned to earth, additional complications would have to be taken into account.
For the sake of the story, any time frame the author, or screenwriters, would require could be justified.
Author of the Sodality Universe:
The Road fro Antioch
In the Markets of Tyre
Flight to Lystra
The Theater of Ephesus
The Council on Jerusalem (coming real soon now. In final edits.)
The Shattered World Series begins in 2025.
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