I believe it is way longer than 7 minutes. It's likely days as evidenced by people sitting up in the morgue days after death. That's the reason I will not be cremated, because I believe in Hell.
Regarding brain activity lasting for minutes after "death": We should all remember this when our loved one's die. The brain may still be working, albeit winding down, even with no new blood. They may still be able to hear. Stand by, and talk to them...you just never know.
Been there. Danced to the tune of 277VAC (the crazy leg of 240 3 phase).
I find that hard to believe. Maybe happened 1 time.
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