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Mark,
I'm no DSLR expert but in the case of the DSI II it saves all the sets of stacked darks in a library with the exposure time and temperature. In subsequent imaging sessions it searches through the library and finds a dark with the time and temperature within a set tolerance. If it can't find a match it tells you to take a new dark. I can't see any reason why this wouldn't work for the DSLR - I assume you would need to match up ambient temp, ISO setting and exposure duration. Darks won't remove random noise no matter when you take them.
Peter
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