https://www.youtube.com/user/AndertonsMusic (https://www.youtube.com/user/AndertonsMusic)
Excellent interviews (albeit all Guitarist related), most over an hour. I enjoyed the Steve Vai and Eric Gales ones. Currently on the John Petrucci one.
Thanks. I've noticed that channel, but hadn't watched any of the videos as it wasn't immediately clear if the content was just focused on selling guitars. Now that I know that they are actually good interviews I'll check them out.