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Alternatively, automate dark frame acquisition. When you have finished imaging, take bias and flats and leave the darks firing away. DSLR Shutter should do the job.
Auto off setting to turn the camera off when finished. More sleep. Don't be a slave to calibration.
Darks are only part of the puzzle. Dithering is essential and will improve SNR out of sight. Doesn't need to be exact, just move the target around the sensor between shots.
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