If you do that then you might as well us the ICNR. The number of darks isn't the problem here. In a dark sky you need more darks than in a light polluted sky because statistical reasons. In a dark sky the more darks you have the better quality of master dark that is produced, however subtracting a master dark made of one dark frame or subtracting a master dark made from 100 dark frames would not produce that affect if subtracted correctly.
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