FYI: the name of the virus is Severe Acute Respiratory Syndrome Corona Viurs 2, or SARS-Cov-2 for short. COVID-19 is the name of the disease caused by the virus. (source CDC, WHO)

I think Governor Cuomo has been saying 7 to 21 days is usually how long someone has to stay on one, but that the longer a patient is on a ventilator, the less likely the chance of survival (in other words, death more likely). I haven't seen or heard of any survival rate numbers. The CDC recently added a COVID-19 tracker, so you might find something there, [cdc.gov] . As far as recovery after coming off a ventilator, I think that depends upon how much damage was done to the lungs, so it's case by case.