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When you see seriously deep images like the one of M42 (Was that Skyviking's image, 120 hours sounds familiar) where the very faint stuff was estimated to have as few as one photon hitting the sensor per 20 minute (Or longer) exposure you can see the point of gathering more and more data.
There does have to be a point of diminishing returns where you move on though, but only the person capturing the image can decide where that is. If you get to the point where each successive frame is no longer producing a measurable improvement in SNR you are probably pretty close.
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