Is this the longest CPR on a patient who survived?

Patient was hypothermic and had a cardiac arrest but survived neurologically intact
CPR

An Italian mountaineer has survived what is believed to be the longest CPR attempt without extra life support when a team worked on the man for almost six hours. 

One of the doctors who helped revive the man says the “remarkable” case shows that patients who are hypothermic have a chance of recovery after even several hours of resuscitation.