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FWIW. I use 100 bias images and 50 flats. It took me about 10 minutes to take them all, cause the bias shots are 1/4000th of a second and the flats are 1/40th of a second, imaging my LCD monitor.
I haven't bothered with any darks so far because the D5100 just doesn't generate any heat noise to speak of with even 2 minute subs here in winter. I'll likely have to take some in summer, but I'll take them during the day, inside at about 20'C. Again, I'll be going for around 50 darks. Any less and the variation will just cause more noise in my final images than without.
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