So you’re extrapolating an answer based on just two days of sales for a store that has just under 6000 items for sale?
When my store was open it was in the range of 27-30K pieces, I sometimes got multiple orders per day, but more likely I went a week or two w/o anything, it was very irregular, so I have no useful guesses based on my own selling experiences. I would assume that the stores with 1million+ pieces are getting plenty of orders daily, but I have no idea how many.