What is the longest album ever?

The longest album ever released is "Jewel Box" by Elton John. It was released on November 13, 2020, and contains a total of 148 tracks spread across eight discs. The album features a mix of rare and previously unreleased material from Elton John's extensive career, including demos, B-sides, and deep cuts. "Jewel Box" has a total runtime of over 10 hours, making it one of the longest albums in music history.