This is by far the biggest reason for longer game times. It used to be that between-innings breaks were only about a minute long, even in the post-season. The players jogged out to their positions at the same time that the opposing team's players jogged in, the pitcher took 8 warm-ups, the ball went around the horn while the batter stepped in, and off they went. The players dictated the pace of the breaks and TV had to accommodate that. Now it's the other way around. I believe breaks are now 2:30. With 16 or 17 breaks per game that adds over a half hour to each game.