Hello how may I help you? Hi! How may I help? can you look up a record for me? Sure. What record would you like to know about? what's the longest thing in the world? It's the Seattle World Fair's Cake at 23 feet long. how long was the longest sub sandwich? The longest sub recorded was 23 inches long. what about the longest strand of hair? The longest hair strand is about 35 inches long cool, thanks for the facts Great. have a nice day.