Longest harmonica marathon
Who
Bonny B.
What
0/24/0 hour(s):minute(s):second(s)
Where
Switzerland (Fribourg)
When
The longest harmonica marathon is 24 hours and was achieved by Bonny B. (Switzerland) at the Blues Club, Fribourg, Switzerland, on 1 March 2009. Bonny was able to go for the whole duration without a single break.