How large were the Augean Stables that Hercules had to clean?

The Augean stables that Hercules had to clean held 3,000 cattle and had not been cleaned in thirty years.

Cleaning them was the sixth of Hercules’ seven labors.

Hercules’ story was told by Ovid (43 B.c.-17 A.D.) and Apollodorus (first-second century A . D. ).