This seems incompatible with reports I read here of people hanging on the phone for an hour so I have done a few sums. If these are correct, for every person who has to wait for an hour, 95 only has to wait for 5 minutes. However if 467 callers can get through in one minute then it still works out OK if only one has to wait an hour.
I know that this is a massive over simplification and maybe it's just me being a cynical old s*d with nothing better to do, but I keep thinking of a quote from Winston Churchill,
"I only believe in statistics that I doctored myself"
My last wait was so long the home phone handset's battery ran out! I also waited 35 minutes, was then transferred to another department but got cut off before I could speak to anyone! If I wasn't retired I just wouldn't have the time to make these calls.