First, the English is poor in the question. It should be "What is the maximum number of players that can bat in one Baseball inning."
The Answer is easy: Theoretically, every player on both teams can bat in each team's respective half of the inning. So, the maximum number that can bat is limited only by the number of players on the roster, which varies by the time of year. After the 9 starting players have batted, they can all be pinch-hitted for by 9 other players, and so on until every player on the roster has batted. This presumes, of course, that they don't reach 3 outs before every player has batted.
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In MLB, there is no maximum number of innings; the game is played until there is a winner. However, some youth and co-rec leagues may establish a maximum number of innings, this could result in a tie game.
Depends on some definitions.
So the most expansive definitions gets you to 15. 16 in a softball league that allows 10 defensive players.
No, but the manager usually pulls a starting pitcher when they have thrown about 100 pitches.