My Keurig Mini Won't Brew. You can store brewed coffee in your refrigerator for up to one week. Store the brewed coffee in a tightly sealed container to keep out any of the flavors or odors from the other items you are storing A keurig gives you access to a convenient cup of coffee whenever you need it. I think the switch that activates when the handle is closed wasn't working properly. I had this problem too. However, just like a standard coffee maker, you’ll need to clean it on occasion. If it is brewed at a high enough temperature, tea can keep for up to eight hours.