There is always something to do, whether it be stocking, setting new layouts, recovering sections, checking customers out, or handling customer service throughout the store. Depending on the year, and/or how profitable the location is, that initial list of things to do can fluctuate between smooth to stressful. Working in retail and different locations, you get to know a wide variety of people and learn how to handle situations and questions you may not have thought you would need to know. Management at every store is different and each store is thus ran a bit differently (though in practice each store should follow the same rules). At the end of the day though, you do what you can and clock out and start over the next day.
Hours not guaranteed, policies vary