There's an extra minute(50 seconds, but lets round up) in commercial breaks during the postseason,
according to the WashPo.
Actually, those aren't the times I see in that article. That source says:
WASHINGTON POST, Feb 19, 2018
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In addition, commercial breaks between innings and during pitching changes will be reduced to 2 minutes 5 seconds for most regular-season games, 2:25 for nationally televised regular season games and 2:55 for postseason games.
And CBSSPORTS says something similar but not including "most" on the same date:
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Yes, MLB agreed to shorten commercial breaks during the regular season. Can't say I saw that coming. Here are the new between inning commercial break times:
Regular season games: 2:05 (previously 2:25)
Nationally televised games: 2:25 (previously (2:45)
Postseason games: 2:55
As part of the shortened commercial breaks, pitchers can throw as many warm-up pitches as they want before the timer runs out, though they are no longer guaranteed eight warm-up pitches. Here are the actions required within the time limits:
25 seconds remaining: Umpires directs pitcher to complete final warm-up pitch.
20 seconds remaining: Batter is announced and must leave on-deck circle.
0 seconds remaining: Pitcher must begin to deliver a pitch to the batter.
The umpire can award the pitcher additional warm-up pitches under special circumstances, such as potential injury, the grounds crew tending to the field, or other on-field delays.