What was the longest major league baseball game in history?

Time: 8 hours and 6 minutes by the Chicago White Sox and Milwaukee Brewers on May 8, 1984. The game went 25 innings with the White Sox winning 7-6.

Innings: 26 by the Boston Braves and Brooklyn Robins on May 1, 1920. The game was called due to darkness with the score at 1-1.