Here are a couple more Buddy Holly covers to add to the Megapost...tip of the hat to reader Dan who suggested some of these...
Grateful Dead -- Not Fade Away [Live]
This version is the shortest I've found at 3:21 and can be found on Dick's Picks Vol. 2.
Grateful Dead -- Not Fade Away [Live]
This version is a middle of the road performance (in terms of song length) at 9:03 and can be found on Dick's Picks Vol. 17.
Grateful Dead -- Not Fade Away [Live]
This version is the longest that I have found at 19:58 from Dick's Picks Vol. 15.
Jimmy Page -- Rave On
From the No Introduction Necessary album.
Nitty Gritty Dirt Band -- Rave On
From the Uncle Charlie & His Dog Teddy album.