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You could make the hallway look longer with a painting of a long hallway stood-up near the real-hallway's bend. You might need several paintings, if you plan to have your camera look down the hallway from several points-of-view-- to assure that the perspective looks right in each shot.
It's much easier to make things look the way you want in the camera, rather than fake-something in post. That said, make sure you test (before your actual shooting day) any tricks you plan to rely on in post to change the look of the scene.
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