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How long did the Hadean eon last?

Hadean

Hadean

770,000,000 years
wikipedia
What was the duration of Hadean, the first eon during which the earth was formed from the accretion disk of the early solar system, through to the early signs of life?
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External web pages (using standard web search):

How long did the Precambrian era last
The Precambrian Era. The name means: "before the Cambrian period." This old, but still common term was originally used to refer to the whole period of earth's history before ...
http://wiki.answers.com/Q/How_long_did_the_Precambrian_era_last
How long did the Mesozoic era last
The Precambrian Super-Eon lasted from the formation of Earth 4,567 million years ago until the start of the Pharerozoic Eon 542 million years ago.It lasted 4.025 billion years.
http://wiki.answers.com/Q/How_long_did_the_Mesozoic_era_last
Hadean - Wikipedia, the free encyclopedia
The Hadean ( / ˈ h eɪ d i ə n /) is the geologic eon before the Archean. It started with the formation of the Earth about 4.7 Ga (billion years ago) and ended roughly 3.8 Ga ...
http://en.wikipedia.org/wiki/Hadean
How many years are in an eon? - Yahoo! Answers
"For the Gnostic word, see aeon. For other senses of this word, see eon (disambiguation). In general usage, an eon (sometimes spelled aeon) is a period of time ...
http://answers.yahoo.com/question/index?qid=20070423180954AANPXzH
How long did the precambrian era last? - Yahoo! Answers
Precambrian is an outdated term, although still widely used among Geologists. The Cambrian Era began about 0.6 billion years ago (or 570 million years ago).
http://answers.yahoo.com/question/index?qid=20080207135454AAW77r5

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