After they were so humiliated about misusing the measurement they came up with this convoluted explanation:
https://starwars.fandom.com/wiki/Kessel_Run

The Kessel Run was a hyperspace route[2] within the Akkadese Maelstrom used by smugglers and unscrupulous freighter captains to move spice from the spice mines of Kessel at the behest of the Pyke Syndicate, who relied on the foolhardy Kessel Runs to deliver the illicit substance to their customers.[4] Han Solo, piloting the Millennium Falcon, made the infamous run in slightly over 12 parsecs,[5] boasting about his ship's ability to endure shorter but more hazardous routes through hyperspace.[6] By doing so, Solo broke a long-held record.[2] The route Solo used to achieve this feat was an ancient Purrgil migration route.[1]

In a commentary track on the Star Wars Blu-ray release, George Lucas stated that ships in the Star Wars universe can't travel in straight lines while in hyperspace due to collisions with celestial objects. Thus, distance is an important factor in how quickly a ship can get from point A to point B. The Millennium Falcon's superior navigation computer allowed it to travel shorter distances between points and arrive faster.

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Heater