Cliff Corcoran, The Athletic:
To get a sense of the impact the three-batter minimum might have [in 2020], I compiled every pitching appearance lasting fewer than three batters this season. Through Tuesday night, there had been 167 games played in the young season. In those games, there were 153 pitching appearances lasting fewer than three batters, an average of just under one per game. ...
Had it been in place this year, the three-batter minimum would have extended just 53 of those 153 appearances. That's roughly one every three games. With pitching changes limited to two minutes (120 seconds) under this spring's rule revisions, the data suggest that the three-batter minimum would result in a maximum reduction of 40 seconds in the average time of game.