Looks like it's anywhere from 10 minutes to 3 days.[1] [1]https://www.popsci.com/article/science/how-long-could-you-survive-coffin-if-you-were-buried-alive/ ht

Looks like it's anywhere from 10 minutes to 3 days.[1] [1]https://www.popsci.com/article/science/how-long-could-you-survive-coffin-if-you-were-buried-alive/ https://www.popsci.com/article/science/how-long-could-you-su...