The FA Cup tie between Alvechurch and Oxford City (both UK) in the fourth qualifying round in November 1971 lasted for six games and 11 hours. The match results sequence was 2-2, 1-1, 1-1, 0-0, 0-0 with Alvechurch finally winning 1-0.

source: FA website: http://www.thefa.com/TheFACup/TheFACup/NewsAndFeatures/Postings/2003/05/48711.htm