He's said it in the recent seasons:
TAR 29: You are about to pair up with a complete stranger for a 9-country 17-city 36,000-mile race around the world...
TAR 28: In just 21 days, you'll visit 18 cities and 10 countries and travel more than 27,000 miles.
TAR 27: [None aired]
TAR 26: [Opening narration, not to racers] Is it possible to find new love on a 35,000-mile race around the world?
TAR 25: [None aired]