We had a recce two days before where we discussed logistics and the shot list. Every shot was staged on the day. For example, this is my shot of a previous space from my recce:
(i posted it before but i'm using a different 'before' shot that was shot on a different day to illustrate what i'm getting at)
1DM38551 by mike kelley / mpkelley.com, on Flickr
and this is the final shot, with staging and retouching that was taken two days later:
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ASCAP by mike kelley / mpkelley.com, on Flickr
Granted, the recce shot is completely underexposed (i was using a 17-40 at something like f6.3 or something, in a dimly lit room, handheld)and unusable save for anything but planning and visualizing the final image, but i think that explains what might take so long.
These are also all shot tethered and the client is there approving images as they come off the camera.