What is oddly absent from the time comparisons is the practice of video review (not just explicit challenges, but the pauses for internal reviews of close calls

What is oddly absent from the time comparisons is the practice of video review (not just explicit challenges, but the pauses for internal reviews of close calls to decide whether to challenge). This is not inherently a bad thing, IMHO. What does need discrete limits is the number of player (not coaches -- which are already limited to once an inning without removing the pitcher altogether -- just catchers and infielders) visits to the mound. Some teams, like the Dodgers, will do multiple such visits within a plate appearance.