I Forgot.
I have a "freedving manual" from Freedive Australia.
Their breathing "rule" was something along the lines :-
"Never ventilate more then half the time it would take to get symptoms of hyperventalion - tingly hands feet etc, funny taste in mouth."
ie With the same breathing speed/depth, if you get the tingles at 4 minutes, only ventilate for 2. Not really exact but I think most people can guess.
Not sure where this rule came from, guessing it was from the French comp divers, since thats who Sacha Dench trained with.
Cheers,
Wal
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