The longest recorded time that someone has been successfully revived after being declared dead is 17 hours. This remarkable feat is attributed to Velma Thomas, who experienced a heart attack in 2008. Her case has garnered significant attention and is considered a world record for the duration of clinical death before revival. Multiple sources affirm this extraordinary event, highlighting the medical community's astonishment at her recovery.

For detailed accounts of her experience, you can refer to articles from JOE which document her baffling return after 17 hours of being clinically dead, as well as discussions on platforms like Quora and Reddit which specifically address the longest known times for revival. The phenomenon is further explored in articles detailing the "Lazarus syndrome," which involves spontaneous return to life after a near-death experience.

Other notable mentions include medical cases like that of Audrey Schoeman, who was revived after six hours of cardiac arrest—a significantly shorter duration but still recognized as exceptional.

If you're interested in learning more about Velma Thomas's story and the medical insights surrounding these cases, you can check out the full details in the following links:

• JOE article on Velma Thomas
• Quora discussion
• Wikipedia on Lazarus syndrome

Sources

What is the longest time anyone has died before coming back to life ...Lazarus syndrome - WikipediaThe longest a person has clinically died and come back to life is 17 ...Woman baffles doctors after being dead for 17 hours and then ... - JOELazarus Phenomenon or the Return from the Afterlife—What We ...Incredible story of woman who came back to life after being dead for ...Briton Audrey Schoeman revived after six-hour cardiac arrest - BBC

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