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It's not a fixed number of years, but figuring 3-4 generations per century is a pretty reasonable estimate.

This of course refers to human generations - animals, plants, bacteria, viruses all have varying generation periods. The following website, however, argues that humans started out with a generation length of 930 years. I'm not sure which database they rely on for their information!:

http://www.millennium-ark.net/NEWS/10_Prophecy/100104.last.generation.html

The fruit fly, Drosophila melanogaster, for instance, has a generation length of around ten days, which is why it is so widely used for genetic research.

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14y ago

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