1 pound of NuFlow = 454 grams / ( 2 grams per 100 grams dry mix) = 227 portions x 100 grams mix =22,700 grams spice mix = 50 pounds of spice mix. (Well, that was convoluted, but I was going off of the 100 gram portion quoted above...
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1 pound of NuFlow will fix up 50 pounds of spices.
And to stretch it out even further, be aware of atmospheric conditions when packaging. If you can work it on a dry/low humidity day, that will help the mixes. Try not to package on rainy/high humidity days. On occassions when I knew I had to get some mix done and the weather wasn't cooperating, I closed the kitchen up and opened one of those de-humidifier containers for about 12 hours. If you try to package in a dry environment, the NuFlow might be dropped to 1% which would let 1 pound NuFlow treat 100 pounds of dry spices.