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In modern day baseball, teams generally have five starting pitchers, and they take it in turn to start a game every fifth day (hence the phrase rotation). Sometimes, if the schedule pans out, a team can get away with a four man rotation, and in the distant past some teams managed a three man rotation.
1 Hitters must be in the batter's box by 1:45. 2  If the hitter's not ready, the umpire can call a strike. 3  If the pitcher doesn't throw a pitch by 2:05, the umpire can call a ball. 4  Teams will have a maximum of 2:30 to change pitchers, with the clock starting as soon as the reliever enters the playing field. If the pitcher doesn't throw a pitch by 2:05, the umpire can call a ball. 2  Teams will have a maximum of 2:30 to change pitchers, with the clock starting as soon as the reliever enters the playing field. 3  Teams are limited to a maximum of three mound visits per game, not including pitching changes.