Had a stroke of all machine been turned of brain dead how long go you usually survive for?

If a person experiences a complete cessation of brain activity and is considered brain dead, they can survive for a limited time, typically a few days to weeks, depending on the functioning of other organs and medical interventions. Life support systems may prolong this period, but without brain activity, the prognosis is grim. Ultimately, the individual will not recover, as brain death is irreversible.