What is the longest someone has ever been clinically dead, but was resusitated?

Factual Questions
1

???

2

Cold-water drowning

3

Here’s a fairly well-known case of a toddler that was “clinically dead” for a couple of hours after outside naked during an Alberta winter.

4

Jimmy Tontelevich spent 2 hours and 40 minutes under the ice of Lake Michigan before being pulled from the water and revived. I’d offer a link, but couldn’t find one. It was quite some time ago

5

It was hard to find, but I finally found some links: http://openweb.tvnews.vanderbilt.edu/1985-1/1985-01-15-ABC-7.html

I remember this incident. It was all over the news for quite a while when it happened.