NFHS games are 32 minutes long... (36 minutes in MN... 18-minute halves).
5 fouls / 32 minutes = 1 foul per 6.4 minutes.
NBA games are 48 minutes long.
6 fouls / 48 minutes = 1 foul every 8 minutes.
Adding a 6th foul to NFHS games would allow one foul every 5.3 minutes.
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