The extreme ages of Sumerian kings before the great flood

The embed above is a page from a book I recently finished reading.  The Ark Before Noah: Decoding the Story of the Flood, by Irving Finkel (Doubleday, 2014).  The main focus of the book is a delineation of the ancient flood myth inscribed in cuneiform characters on clay tablets from ancient Mesopotamia, and to suggest the relationship of that flood myth with the one in the Hebrew Bible that was written several millennia later.  I'll do a proper review of the book soon, but it has lots of interesting stuff in it, such as this listing of the lengths of the reigns of the ancient kings of Sumer.

For those wishing to pursue this topic more deeply, there is an introductory page in Wikipedia about The Sumerian King List.  The period before the flood is presented as follows -

This section, which is not present in every copy of the text, opens with the line "After the kingship descended from heaven, the kingship was in Eridu." Two kings of Eridu are mentioned, before the city "fell" and the "kingship was taken to Bad-tibira". This pattern of cities receiving kingship and then falling or being defeated, only to be succeeded by the next, is present throughout the entire text, often in the exact same words. This first section lists eight kings who ruled over five cities (apart from Eridu and Bad-tibira, these also included Larag, Zimbir and Shuruppak). The duration of each reign is also given. In this first section, the reigns vary between 43,200 and 28,800 years for a total of 241,200 years. The section ends with the line "Then the flood swept over". Among the kings mentioned in this section is the ancient Mesopotamian god Dumuzid (the later Tammuz).

As Finkel notes in his books, those lengths of time (28,800, 36,000, 64,800, 43,200, 28,800, and 108,000 years are all in multiples of 3,600.  The Sumerians used a sexagesimal system of time created using base 60, so the units of 3,600 would be 60x60.  

I'm not going to explore this at length now, but I will append one other source - The Sumerican King List - from Livius (a website on ancient history created and maintained by Dutch historian Jona Lendering.