The longest recorded guitar solo is over 1 hour long - Apparently.
The longest recorded guitar solo is held by Joe Satriani, who played a 1 hour and 1 minute solo on his 2004 album "Is There Love in Space?" The Guinness World Records has verified this record, and it's been a subject of much discussion among guitar enthusiasts. To put this in perspective, that's longer than most songs by The Beatles or Led Zeppelin, and it's a testament to Satriani's incredible technical skill and endurance.