Assume the on$-$line store in question FE $5$ above make the products ready for shipping on a package line, i$.$e$.$ they pack items in customised packages, labelling etc. Before shipping, they store the products in an internal warehouse. Between the warehouse and the package line they want to use a Kanban system. The package line is supported by a materials manager, who inspects the line every hour. According to his notes, the time from demand to replenishment is $3$ hours. They transport the products in containers, each containing $20$ units. The package line work only day shift, i$.$e$.$ the operation time per day is $6$ hours.