Here's the original Reddit post by u/tandyman234:
Many Reddit users replied to OP's question and revealed their all time favorite documentary:
Enron - The Smartest Guys in The Room
The Inside Job
Ice Guardians, Hired Guns, and UNTOLD: Crime and Penalties.
The Vietnam War by Burns Novick
Resurrect the Dead: The Toynbee Tiles
Touching The Void
The Dawn Wall
Ken Burns: The Civil War & The Vietnam War
Ken Burns on The Dust Bowl
You can't rematch it with other people.
Paris is Burning
Barkley Marathon: the Race that Eats Its Young
The Day the Universe Changed - James Burke OR Cosmos: A Personal Voyage
Icarus — Bryan Fogel
The Jinx: The Life and Deaths of Robert Durst
THE RESCUE -- The daring rescue of twelve boys from a cave
Jiro Dreams of Sushi
9/11 ( A Documentary by Gédéon & Jules Naudet )
Dogtown and the Z-boys
Free Solo -- Dawn Wall -- Meru
Dear Zachary: A Letter to a Son About His Father
Three Identical Strangers
King of Kong: A Fistful of Quarters
The Act of Killing -- Grizzly Man -- Shoah
The Lion in Your Living Room -- Kedi
Some documentaries are so good that they draw you in entirely and captivate your attention for hours on end. You can try to stop yourself from watching it in its entirety but you won't realize that it is over until you notice the credits rolling, and by that time it's already over for you.
The Reddit users above gave some pretty good suggestions that I will definitely be checking out very soon. Now we all have a full list of documentaries that can binge watch at any moment. What a time to be alive!