What is gravy time?

"Gravy time" does not refer to any specific concept or event beyond its literal understanding and is not widely known as a common expression or phrase. "Gravy" commonly refers to the sauce made from meat juices and stock served with roast meats, and "time" refers to a point in duration or a specific instance. However, if you have come across the term "gravy time" in a unique context, please provide more information so that a better explanation can be given.