- Who
- Carel Henn
- What
- 26 hour(s):minute(s):second(s)
- Where
- Canada (Bonnyville)
- When
The longest marathon cello playing is 26 hours, and was achieved by Carel Henn (South Africa) in Bonnyville, Alberta, Canada, from 19 to 20 December 2014.
The attempt was a fundraiser to raise funds for Bonnyvile Baptist Church.