Augea was a planet whose days were equal to three of Earth's months.
Through an odd coincidence, the Doctor was involved with twelve quests which mirrored the 12 Labours of Hercules. One of these tasks was to clean out the Augean Stable in a day, though due to the length of a day, Hercules and the Doctor finished the task with plenty of time to spare. The next task was to clean up after Cerberus, which the Doctor found to be much more difficult. (PROSE: Sting of the Zygons)