Sometimes 1 or 2 cups of coffee just won't do, plus you have to get up every 20 minutes to get a new cup, and nobody likes to stand, or heaven forbid... walk. This is when the Giant coffee mug comes in handy, just fill it up once, and you are good for about an hour or two. The giant coffee cup holds 20 regular sized cups of coffee otherwise known as 1.25 gallons of coffee. The giant coffee mug is made of porcelain and is 9 inches tall and 11 inches in diameter.