A furnace that can hold 60 crowns does not produce 60 crowns a day. It produces however many pass inspection — and those are two very different numbers.*
Ask a dental laboratory how many crowns its sintering furnace https://sintering-furnace900241.polarisnewsblog.com/486102/how-many-zirconia-crowns-can-a-sintering-furnace-really-produce-per-day