Remember in the Bible, the man who was possessed by demons calling themselves Legion. In Biblical times, a Roman legion numbered about 5,000, so he would only need to exorcise demons from 14 similarly afflicted people to make his number.
This guy was a specialist. His job was exorcisms, and people were brought from all over to him in Rome. Given that it was his full-time job, allowing an hour for a typical one, 4 a day is about what you’d expect.
Plenty of 85-year old doctors have seen way more than 70,000 patients.