Led Zeppelin 'Dazed and Confused' Live
It's 26:53 on the 'Song Remains the Same' album but was even longer in concert. Here's a 45 minute version live in concert:
https://www.youtube.com/watch?v=ENXqzMhoolo
Allman Bros: Jessica
The Allman Brothers released several live versions of “Blue Sky” that were 10+ minutes long. They are arguably the best live band of all time.