No one would say that.
A light-year is a UNIT of distance, not time.
The Big Bang Theory Season 1, Episode 17
Cut him open
and start copying over
his control UNIT.
Westworld Season 2, Episode 7
"Affray in Marcelo Usera, any UNIT near?"
Money Heist Season 1, Episode 6
...of the never-to-be-realized
ideal family UNIT.
The Big Bang Theory Season 3, Episode 11
Lieutenant Alcázar speaking,
Civil Guard UNIT.
Money Heist Season 3, Episode 2