According to Official Guinness Records,
The longest friendship bracelet measures 660.48 m (2,166 ft 11.16 in) and was created by Benchmark Senior Living (USA) in Ridgefield, Connecticut, USA on 3 August 2016. The residents of Benchmark Senior Living came together to attempt this record to raise awareness for the Alzheimer's Association. The bracelet symbolizes the challenging journey of those living with Alzheimer's and of their caregivers.
For a complete list of 2016 records, please visit 2016 Guinness Records in United States.