That is one of the problems of film vs. book...
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..."...elves are light-footed, and though they were not in these days much used to the marches and the treacherous lands between the Forest and the Lake, their going was swift. Only five days after the death of the dragon they came upon the shores and looked on the ruins of the town. Their welcome was good... ...and the men and their Master were ready to make any bargain for the future in return for the Elvenking's aid."
In film you rarely get a good sense for the passage of time. When we see There and Back Again in theaters (or at home) I am sure that most viewers will have the impression that the Wood-elves arrive at Lake-town only hours (or a day or two at most) after the death of Smaug. Certainly not after five days. 'There are older and fouler things than Orcs in the deep places of the world.' - Gandalf the Grey, The Fellowship of the Ring