Since balls are frequently fouled off into the stands by batters and usually discarded after hitting the dirt, the average baseball has a game life of just a few pitches. Even balls that remain in play are often inspected by umpires if they are hit hard enough. An estimated eight to 10 dozen balls are used in a nine-inning game.
After that, they are used for practice balls mostly and some are donated to youth Baseball groups. So they don't have a long life in a game.