Our "day rate" was always calculated to include these other components. We used to figure, in the Architectural Photography business, two days of administrative and other crap for each day of shooting, so we figured a month had a maximum of 10 shooting days in it, and based our rate accordingly.
I'd be doing the same today, if I were shooting that way; I'd figure in at least an hour of processing for each hour of shooting, so a "day" would be based on 4 hours each of shooting and processing time.
One thing that's important is that your "day rate" reflect a reasonable number of "delivered images"; you don't want to make 300 shots in one day and be committed to delivering them all. Working with the view camera, we figured 4-10 images per day of shooting. Interiors took longer, a couple hours each, so 4 per day was about right. Exteriors, we could get more in a lot of the time.
Short answer, "Yes, put time for post-processing into your estimate."
R.
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