Seven days
The Emperor of the Southern Sea was Shu, the Emperor of the Northern Sea was Hu, and the Emperor of the Central region was Hun Dun. Shu and Hu would often meet in the land of Hun Dun, who always treated them very well. Shu and Hu decided to repay Hun Dun’s kindness，they said, ‘All beings have seven apertures to see, hear, eat, and breathe, but this being alone does not have them. Let’s try to bore some into it.’ Each day they bored one more hole. On the seventh day Hun Dun died.
