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Hi Eris
If your camera has not changed over the time between darks and lights, then it doesn't matter when you take your darks, as long as they are at the same temp and exposure. However, cameras may change with time (different hot and cold pixels for example), so you need reasonably up to date darks. The best thing is to make a library of darks and update them on cloudy nights. If you find your dark frame calibration is not working properly, it's probably time to update.
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