Short answers, pulled from the story.
Revolution 9 runs eight minutes and twenty-two seconds, making it the longest track the Beatles officially released while together as a band. Some reissues assign it a length of 8:13 depending on where the preceding studio conversation is placed.
Revolution 9 was created primarily by John Lennon with assistance from Yoko Ono and George Harrison. The composition carries a Lennon-McCartney credit, but Ono stated in the 2011 documentary George Harrison: Living in the Material World that Harrison "sort of instigated" the piece.
Revolution 9 appears on the Beatles' 1968 self-titled double album, commonly known as the White Album. It was released as the penultimate track on side four of the double LP.
John Lennon was influenced by the avant-garde and musique concrete works of Karlheinz Stockhausen and Edgard Varese, and by Yoko Ono's experimental recordings. Ian MacDonald specifically noted Stockhausen's work Hymnen as a likely influence.
Identified classical sources include the Vaughan Williams motet O Clap Your Hands, the final chord from Sibelius' Symphony No. 7, and the reversed finale of Schumann's Symphonic Studies. The piece also contains violins looped from the Beatles' own A Day in the Life and sped-up loops from Tomorrow Never Knows.
Manson interpreted Revolution 9 as a sonic parallel of Chapter 9 of the Book of Revelation and as a prophecy of an apocalyptic race war he called Helter Skelter. He also misheard Lennon's distorted screams of "Right!" within the track as the command "Rise!"