Subject: how many generations have passed since Lucy?

Hello, two things I do not find in google: a definition for the length of a
generation that is standard in Biology.(something like average age of female
(male???) between firstborn and last child, maybe?). Second, any estimates on
length of human and humanoid generations and how they might have developed in
the last say 3 Mio years. I thought it would be easy to find in usenet groups or
google, but nothing solid came up. Not trying to proove something kooky, just
curious. Thanks for looking, ed

Re: how many generations have passed since Lucy?