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I think that I read somewhere that the NBA pegged the limit at 6 fouls when they increased the game time from 40 minutes to 48 minutes. There were 5 fouls allowed in a 40 minute game, so adding 20% more time correspondingly meant adding 20% more fouls--i.e. 20% of 5 fouls = 1 foul--for a total of 6.
That's my story and I'm sticking to it.
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