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I set an exposure of 0 seconds with the camera capped and let the driver sort it out, but I have heard of people using exposures of up to several seconds. I don't know how APT behaves for very short exposures. Given the very low dark current you would probably get away with a second or so with everything capped to prevent stray light impacting things.
For a master bias, I used 100 bias frames given that by definition they are very quick to shoot.
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