Feel like getting slammed for breakfast? The home of the Grand Slam Breakfast, Denny's is one of the leading full-service, family-style restaurant chains in the US, with about 1,550 of its signature eateries located across the country. Its family-style restaurants are typically open 24 hours a day, seven days a week, and serve breakfast, lunch, and dinner. The menu features a variety of breakfast items (which account for the majority of company sales) along with such standard fare as hamburgers, steaks, salads, and desserts. The company owns and operates about 400 of its restaurants, while the rest are franchised or operate under licensing agreements.