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I would have thought you'd do a comparison based on constant total integration time. ie if you have 3 hours total on a target how is your time best spent in terms of number of subs vs sub exposure length. Here's how Craig's calcs look for my SN10/QSI at Duckadang vs home (albeit on different targets). This pretty clearly shows for a constant total duration it is better to use a longer exposure to a point where you then get diminishing returns.
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