A related notion is that of an extreme long shot. This can be taken from as much as a quarter of a mile away, and is generally used as a scene-setting, establishing shot. It normally shows an exterior, eg the outside of a building, or a landscape, and is often used to show scenes of thrilling action eg in a war film or disaster movie.
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AnonymousBut I thought 'a long shot' meant "an attempt or a guess that is not likely to be successful but is worth trying".As you have seen, 'long shot' can mean more than one thing. Consider a rifleman trying to hit a target a long distance away. That may help you to understand the metaphoric content of the expression.