According to this news story from several years ago, Major League Baseball is finally getting serious about improving the pace of the game:
They Fixed It!
↵↵The allotment for delivering the ball with no one on base has been reduced, from 20 seconds to 12. The price for each violation is a ball... Conversely, an automatic strike will be assessed each time a batter violates the rule requiring they keep one foot in the batter’s box...
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