Switch on the robo-operator. By the time you return from break, the robo-operator will have pissed off enough callers that there might be one each left waiting.
No, take your break, there will always be 73 calls waiting.
“Please hold for the next available representative. Your call is very important to us — but not important enough to pay for enough native English speakers to answer it in less than 90 minutes.”
Don’t worry, the Hold Music doesn’t start repeating until the number of people on hold goes over 100.