The number of times "pan-pan" or "mayday" is uttered is irrelelevant. Both should be uttered 3 times by pilot as per ICAO standard phraseology and both should get a set response emergency services wise. Calling a pan 4 or more times will illicit no more a severe response than the standard 3, likewise mayday. To be honest if I heard it more than 3 times I would suspect hypoxia, depending on quality of any subsequent transmission