SW obviously doesn't play by "real physics" rules. Trying to apply shit like delta v is never going to work, because we outright get told that ships have a stated maximum speed (not maximum acceleration; maximum speed) when in space. Ships that lose power also don't keep on going at constant speed, but fall back to stand-still.
Incidentally, said top speed is (for the very fastest ships) 100 MGLT, or "Megalight", which is never properly defined. But from context and indicated speeds at a few points in the films (people took the trouble of actually decyphering a few displays we see), it may be inferred that 1 MGLT is roughly 1080 kilometres per hour, or a millionth of lightspeed. (Which... sort of... suits the prefix 'mega', because that implies that a multiplication by a million in involved.) Meaning that the fastest ships have a "top speed" (in space) of 100 times 1080 km/h = 108.000 km/h = roughly 0.01% of lightspeed.
So... going from what we actually see (in the films) and are told (at least in the old EU), no ships can reach a significant fraction of lightspeed in realspace.
Of course, George Lucas gave exactly zero fucks about any of this, which is how you get the implication that the Falcon can just fly to Bespin with sub-light engines in (what is implied to be) a matter of a few weeks, at most. (The EU provided a 'fix' fo this by telling us that the Falcon has a back-up hyperdrive that could get them there, but much more slowly than the main hyperdrive could.)