That's 5.56 full extension punches every second.
Russian boxer and biological punching machine Pavel Trusov secured a Guinness World Record at a gym in Slovakia last year in this amazing display.
I notice that for the first half of the event, he appears to be breathing entirely through his nose. I wonder why. Would mouth breathing be slower even though it would take in more air?
This seems counterintuitive--at least from my individual perspective. I couldn't keep up the necessary airflow when doing intense cardiovascular exercise, such as running or sparring, if I limited myself to nasal breathing.