- Who
- Jennifer Anavi Davies
- What
- 25/30/5 hour(s):minute(s):second(s)
- Where
- Germany (Dachau)
- When
The longest marathon whistling lasted 25 hr 30 min 5 sec by Jennifer Anavi Davies (Canada) at the Impossibility Challenger in Dachau, Germany, on 2-3 October 2010. She rotated among a selection of 125 different tunes, each at least 2 minutes in length.
Davies had previously attempted unsuccessfully to set this record. This was her second career attempt.