if he was serving only one life sentence and had DNR order, then it's fair to say he served his sentence if they resuscitated him against his will if he would

if he was serving only one life sentence and had DNR order, then it's fair to say he served his sentence if they resuscitated him against his will if he would be serving multiple life sentences than he would just fulfill first one, otherwise what's the purpose of multiple life sentences in US? we don't have this nonsense in Europe