According to Official Guinness Records,
The longest salad bar measures 209.742 m (688 ft 1.56 in) in length and was achieved by Jensen Jewelers (USA) at the Saladbowl Bash in Hudsonville, Michigan, USA, on 27 July 2013.
The salad weighed 1,077.99 kg (2,376.56 lb) and contained lettuce, carrot, onion, radish, cabbage, zucchini, celery, cucumber and peppers as well as a selection of dressings.
For a complete list of 2013 records, please visit 2013 Guinness Records in United States.