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That's the joke -

A reference to the Millenium Falcon completing the Kessel Run in "less than twelve parsecs"

Relativistic physics often measures the passage of time in units of distance, though I doubt Han spent ~39 years making that Kessel run.

Relativistic physics often measures the passage of time in units of distance

The explanation or rationalization of this 36 year old joke explains that so does driving in Los Angeles....

How much longer till we get to Disneyland? Just another 10 miles honey.

Regardless, I always preferred 'less than 12 parsecs' as a measurement of the maneuvering within a gravitational well.