The Grateful Dead were pioneers in the world of rock and roll. They were the first to use great walls of speakers, and monitors too so that they could hear themselves. They also had such a huge musical repertoire, from Old Time, Blues, Cowboy songs, Rock and Roll, Disco, to Train Crash Psychedelic, that none of their gigs were the same. They also allowed audience members to tape the shows, and these tapes were always exchanged freely between Deadheads. Often recordings were made from the soundboard, and many of these have been released as CDs. At Dead concerts people jotted down the set list (if they could write). There are archives documenting each show with reviews such as The Tapers Compendium and analyses of their lyrics such as The Annotated Dead and huge vaults of recordings.
One of Elby's fine sons sent him this, a scenario which illustrates the title of this post uncannily.
A quick look at the media player on my computer shows 2825.2 GB of Grateful Dead or
7768:35:58 playing hours.