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I would actually tend to go the other way in one respect. Shooting with a DSLR you are likely to have hot pixels and the longer the exposure the hotter they are going to be, to the point that maxed out pixel values are likely. If you subtract them out with darks you are going to be drilling holes in your real signal. Better IMO to keep moving them around frame by frame to allow for the holes to be averaged out by stacking after the dark subtraction.
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