Read your blog all the time since you generally come up with interesting and robust analysis, but I have to agree this isn’t your finest.

I think the right measure here isn’t “game time” or “real time” or “total plays” though; to do this analysis you would need to see how much play clock a team used on average which is likely not available. This would control for incompletions and length of play (which is clearly a secondary effect but would have an impact on your measure of tempo).

Valiant effort though!

A true measure of tempo is average time remaining on the play clock per snap.