You’re in good company here! If you happen to be familiar with the “Wawa” convenience store chain (popular here on the East Coast), one of the things they are known for having is an underground “test store” near their corporate HQ. I’ve been told that this test store is approximately 5 times the size of a regular store and is fully configurable and stocked with real food and appliances.
The practical applications of this involve things like completely redoing the layout in their delay (for example), and then employees of various skill levels are told, “Make as many sandwiches as you can in 10 minutes”. Because at the scale of 720 stores each making hundreds of sandwiches a day, saving even a few seconds per sandwich can yield substantial results.