in some book it was explained that by saying that he did it in 12 parsecs he is indicating that he successfully took dangerous shortcuts, thus proving his skill as a navigator
When you're dealing with Sci-fi magical worlds, you have to make obvious what is a lie, otherwise people will construct methods and reasons for how it could really* happen.
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however, arguing about old Star Wars nitpicks is also nonsensical
and as asspulla go I think it's rather clever
Ben reacts to Solo's stupid attempt to impress them with
obvious misinformation.