Longest chess marathon
Who
Bob Jansen, Niels Ondersteijn
What
48:00:00 hour(s):minute(s):second(s)
Where
Netherlands (Tilburg)
When

The longest chess marathon is 48 hours and was achieved by Bob Jansen and Niels Ondersteijn (both Netherlands) in Tilburg, Netherlands, from 19 to 21 May 2017.

Bob and Niels attempted this record to raise money for charity.