It depends on the person but after somewhere around 4-5 mins. the brain begins to die.
15 minutes you will die. 11 minutes will cause permanent brain damage. 8 minutes will cause brain damage
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After about 4 to 6 minutes without air, a large amount of brain cells begin to die.
I'd say about a minute,
more or less depending on your health, daily physical activity, healthy life style etc.