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Troy, I normally shoot a cal library twice a year. One as summer starts and a new one when winter starts. I know I can easily achieve -20C in summer and -30C in winter so I shoot at the right temp for the season. I find it normally takes over 24hours to do a full set of cal files ranging from 20min to 60sec for darks binned x1 and x2, a dozen each, plus bias files for x1 and x2 about 30 each. I don't capture at x3 or x4 so don't bother with cal files for them.
I would of course reshoot for the current season if I updated drivers or similar on the system.
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