I think I figured out a hack to get at time in between pitches.
Fangraphs has pitches per game at the team level for both batting and pitching, in their Leaders area. Reference has time of game by team under Seasons/Other.
My simple hack is, take the total number of pitches faced by batters and thrown by pitchers for each team, and divide that by the average time of game multiplied by 162 for each team.
For example: the Tigers threw 24,044 pitches and faced 23,339 pitches as hitters, for a total of 47,383 total pitches thrown in their games. Their games averaged 158 minutes in length—multiply by 162, and we conclude that they played baseball for a total of 25,596 minutes during the regular season. (Apropos of nothing, that works out to almost 18 full days spent playing regular season baseball during the year.) Forty-seven thousand three hundred and eighty-three total pitches divided by 25,596 total minutes equals 1.85 pitches per minute on average in Tiger games during the regular season.
Maybe it's not perfect, but it's probably good enough.
Here's the resulting table for 2025.
Team
Pit/Min
NYY
1.75
TOR
1.77
NYM
1.78
SDP
1.78
TEX
1.78
HOU
1.78
MIA
1.79
BAL
1.80
ARI
1.80
TBR
1.81
SEA
1.81
BOS
1.81
PHI
1.81
LAA
1.81
CHC
1.82
STL
1.82
LAD
1.82
CHW
1.83
MIN
1.83
WSN
1.84
KCR
1.84
COL
1.84
PIT
1.84
ATH
1.85
MIL
1.85
DET
1.85
CIN
1.85
CLE
1.85
SFG
1.87
ATL
1.87
MLB
1.82
The team's in red are the playoffs teams from last season.
My takeaways:
Yeah, the Yankees are decidedly the slowest team in between pitches.
The best teams are not necessarily the slowest teams.
Those Yankees/Blue Jays regular season games must have been murder to sit through.