> If you assume 15 seconds per book at pace, 40 books per shelf, 6 shelves per bookcase, and 30 bookcases in the average store,
Everyone else commenting on the math, but I take issue with the starting assumptions. A bookshelf fits approximately 10 books per foot. A used bookstore, in my experience, tends to have a huge amount of books - shelves to the ceiling (8 shelves high, 5 feet wide). Taking as an example some used bookstores near me, I would estimate a used book store at minimum would have 100 such shelves. 8x5x10=400 books per shelf, x100 = 40000 books. Using your scan time estimate, that gives us 40000x0.25min = 10000 minutes, or 166 hours to scan the isbn (21 days)
Everyone else commenting on the math, but I take issue with the starting assumptions. A bookshelf fits approximately 10 books per foot. A used bookstore, in my experience, tends to have a huge amount of books - shelves to the ceiling (8 shelves high, 5 feet wide). Taking as an example some used bookstores near me, I would estimate a used book store at minimum would have 100 such shelves. 8x5x10=400 books per shelf, x100 = 40000 books. Using your scan time estimate, that gives us 40000x0.25min = 10000 minutes, or 166 hours to scan the isbn (21 days)