Most Iced Tea Spoons are between 7 and 8 1/2 inches long. However, the Iced Tea Spoon in Louis XV by Whiting is 9 1/8 inches. I also found reference to an Iced Tea Spoon in the same pattern that was 7 1/4 inches, and in his book, Sterling Silver Flatware, Richard Osterberg states that this pattern also has the shortest Iced Tea Spoon at 6 3/4 inches.
(Shown in Louis XV by Whiting 9 1/8 inches)
(Shown in Blossom by Jensen 7 inches)
(Shown in Pynchon by Lunt 7 1/2 inches)
(Shown in Harlequin by Reed and Barton 7 5/8 inches)