It's not always about the conversation. Sometimes they call and folks aren't available, they leave a message and wait for a call back. That could take a while depending on the situation. They don't move on until they can verify the response of the individual because of seniority. This happen more when they get close to the end of the class because they can't skip anyone in line. Plus I'm sure there is more to his job then just making phone calls. 😀