A Hundred Days Off is the sixth album by British electronic music group Underworld. The album produced two UK Singles Chart entries: "Two Months Off", which reached No. 12, and "Dinosaur Adventure 3D", which reached No. 34. Although this was the first album since Darren Emerson's departure from the group in 2001, the album is not a huge stylistic makeover as the main focus of the band is still trance, techno, and house, although without the thumping beats that defined their previous album Beaucoup Fish. Instead, the album explores more of an ambient and experimental music style.