Cao Song was very wealthy. According to historical records, he had spent a billion coins to buy his way into the position of one of the Three Dukes. Generally speaking, purchasing an official position could pay for itself within three harsh months. However, Cao Song wasn't too harsh, and recouping his investment within a year was no problem for him. In the following years, it was still possible to rake in several billion coins.
In any case, Cao Song packed up and took away everything, with over a hundred carts of money, grain, and baggage. Obviously, with such circumstances, the return journey would be slow, and it was quite unlikely to reach Chenliu in Yanzhou in one or two months.