Any person who develops thick enough blood, and a slow enough metabolism, should be able to do over 5 minutes on a FULL EXHALE. I think every person, even if they only have a 5L lung capacity, has the ability to do over 9 minutes at least, on a full inhale. This is easily shown by using real-world examples of blood volume, hematocrit, low O2 tolerance, metabolic rate, and so on.
Remember that children have gone underwater and remained there for over 40 minutes without brain damage. Don't say that they had HUGE lungs and great training...! This just shows the effect of body temperature, and decreased brain metabolism (since children's brains consume much less O2 than an ordinary 'awake' adult brain).
The minimum metabolic rate for mammals has been calculated. If you do the math, and take a fit person with big lungs, the theoretical limit for static is over 6 hours without loss of consciousness. So, to say that you can 'never reach 8 minutes' is definitely false.
Only a few years from now the record will be over 10 minutes and most people will be playing with 8 minutes rather than 6.
Eric Fattah
BC, Canada
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