Depends on the pizza maker really. When i open to close the store on a $1500 day, i might have 8 oz of combined cheese/food on the floor from falling off the pizza between the makeline and oven, and what just falls off the makeline while making the pizza. I also pick my catch trays before throwing out anything unuseable. So maybe another 8 oz from the catch trays all day.
Now certain employee’s i have, could put that much food on the floor in 2 hours barely doing $400 in sales.
On the whole tho, my food is generally within 1% of ideal every day (we generally run negative 0.5%). If you have a POS just use your ideal vs actual useage as long as you know the counts are accurate. But if your working in the store every day, just step back and watch everyone work on the makeline.
It is amazing to see people not aware of how much food they throw on the floor because of sloppiness.