The news was presented at the AAAS meeting in Phoenix, Arizona. Anna Fowler presented a synthesis of dozens of studies on near-death experiences and neuroelectrical activity around cardiac arrest. - https://particle.news/story/aaas-presentation-argues-consciousness-may-persist-minutes-to-hours-after-clinical-death
EEG collapses completely after 30 sec of stopped blood flow. Consciousness will be probably gone in 10-15 seconds.