[Djonckheere]

Apparently less than 15-minutes of athletic action in a typical 3-hour game, with ~45-minutes devoted to advertising: [2020] How Much American Football Is Even in an American Football Broadcast? https://news.ycombinator.com/item?id=22218909

This explains why NFL RedZone exists.

Fun comparison, a typical Formula 1 Grand Prix clocks in at ~1.5 hours. Live race broadcasts (e.g. Sky Sports F1) will typically show the entire race with no commercial breaks or interruptions. Same goes for MotoGP (e.g. TNT Sports), where a sprint race (~10-12 laps) takes just 25 minutes, not including post race podium and interviews.

English Premier League game durations come in at just under 2-hours with a full hour of athletic action, the remaining 50% occupied by a 15-minutes halftime, substitutions, free kicks, and a mere 10-minutes of commercial interruptions.