High CO2 - How long before organs shut down

Patient : My Mom has COPD and Enphysema (sp). Long story short, she has been on a ventilator 5 times and has decided she doesn't want to do that again. We understand that she will begin sleeping more and more and eventually won't wake up. How long once this occurs does it take for all of the organs to shutdown/stop working? I don't mean to sound cold....really don't but we want to be there for her and were just wondering what to expect. Thank you. Nan Huffman (huffmann2664@yahoo.com)
Symptoms:  High CO2
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