What is the longest baseball game played at comerica park?

The longest American League game to end in a tie was a 24-inning contest between the Detroit Tigers and Philadelphia Athletics on July 21, 1945. The teams were tied 1-1 when the game was called due to darkness at Shibe Park; the Tigers' Les Mueller had pitched a record 19 2/3 innings (and only given up one run) before being taken out in the 20th.