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The more dark frames you have, the better, but you get diminishing returns after sometime.
You can re-use your dark frames - I've been building a library as well. I usually use dark frames that are within a few degrees of the light frame. You may need to re-evaluate them in the future as the camera sensor changes, but I suspect they should last quite some time.
If I do flats, I generally just do the dark flats at the same time, since it's fairly quick to do.
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