A multiple watch winder box can wind several watches simultaneously, with capacities typically ranging from 2 to 24 watches depending on the model. Some larger multi-watch winders can hold even more than 24 watches, making them suitable for serious collectors. These devices often allow individual customization of winding settings for each watch, including rotation direction and turns per day, to accommodate different watch models' needs.

For smaller setups, double watch winders hold two watches at once, offering convenience and customizable programming options for each watch. Larger multi-watch winders can have configurations such as 2, 4, 6, 7, 9, 8,12 or 24 watch slots, with some models featuring individual rotors and multiple winding programs to suit various watches simultaneously.

In summary, the number of watches a multiple watch winder box can wind simultaneously ranges from 2 (in double winders) up to 24 or more in larger multi-watch winders, depending on the specific product and collector's needs.