Longest harmonica marathon

According to Official Guinness Records,

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.

For a complete list of 2009 records, please visit 2009 Guinness Records in Switzerland.

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