Just search around the web every so often looking at what's going on in the diabetes community and nursing homes.  After my sister died in July 2012, I guess it really had an effect on me about this condition and what people go through.  I've been at this for over 4 years now.  She had a brain injury from a severe hypoglycemic event on 4/16/12 while at a nursing home for rehab/wound care after an extended hospital stay.  She was to get a glucagon shot but they evidently didn't have it and didn't call 911, so gave oral glucose gel to a person rapidly becoming unresponsive. She ended up with anoxic brain injury, coma, respiratory arrest and aspiration pneumonia at the hospital.  It had been 35 min before the paramedics were called and got to her and she was near death.  She was on life support for three months and during that time felt only pain.  There had been times of some hope but I was eventually told she would remain in a vegetative state so I did the only human thing and removed her from life support.  The past four years, I've been disputing the nursing home and government authorities here who have tried to conceal what happened and refused to answer my questions about this. I just can't figure out why they refused to enforce laws that exist and cite them for what they did but that is why I continue on this course.  Hope you may have found someone who could give you the info you needed about a longer time on a coma.