72 hours

There is a timeline for someone in mom's situation: you got to have progress in 72 hours or less.  We're past the deadline without progress.  The only thing keeping her alive now is a respirator.   Now a decision has to be made about the respirator.

How does a son make a decision to give up?  A husband?  When does it become selfish to keep someone alive just so you can avoid saying goodbye?  72 hours I suppose.