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As a teen, practicing motionless in a pool w/ weight belt on - worked up to about 3 minutes (big influence from the Luc Besson movie "The big blue" about free divers)... it's 100% about practice...
But that translated loosely to less than a minute bottom time in the ocean though, depending on conditions, weight or not, fins or not, and whether I needed to get close to 10m or not... I only learned about the danger of the 10m threshold 20y later later at Scuba school... And mostly I was by myself... Oops. Sometimes one wonders how we survived... A friend's dad was an animal at the time, he could stay 3 minutes at the bottom in the ocean regardless, fishing for sea urchins, it was crazy to watch him from the surface...
I read something about the commercial free divers recently, the ones who constantly dive for pearls - few live past late 30s... I guess too much of that stuff is not good for you ! I can still do an olympic pool under water, but not much more nowadays.
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