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OK, now I understand what you are trying to achieve.
If you have a reasonable window to take your lights, go ahead and take them, you can always expose your darks later, eg, when you are packing up, shutting down. Just remember that when you expose the darks, they need to be at the same length, ISO and whatever delays you set, it is preferable that they be taken at the same temperature, by that I mean, they can be taken at the end of your imaging run. The aim of the darks is to map the electronic noise that has been built up during an exposure and when combined to make a Master Dark, you then subtract it from shot.
I have a set of Master Darks I have made covering various exposure times and have used them on shots of the same length, this is not ideal and I usually try to take a set of darks whenever I shoot.
Hope this is what you are after.
There is a good article on this in the archives somewhere, can't seem to find it at the moment.
Cheers
JG
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