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There are no specific times, but in general, unconsciousness will occur in 5 to 10 seconds with irreversible damage setting in as little as two and a half minutes. Past eight minutes , a person can, for medical purposes, be considered definitively dead. (There are a very small number of exceptions; e.g., Hypothermic body temperature can slow biorhythm enough to prevent damage over a longer time period.)

Keep in mind that the human brain and neural system is unpredictable and these are only general values. The above stated relates to oxygen deprivation caused by non-circulation of the blood, as your question seems to imply.

In very rare cases, even with resuscitation a person can die due to other complications. (These are usually neural complications that can cause problems with natural heart-beat regulation by the brain.) How likely this is depends on what caused the cardiac arrest.

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