time-depth of language families

Um, excuse this natlangy question, but the Arda-Lang thingy
and a discussion on another list got me thinking on the
time-frame of language families. Do we know -- or at least
have a good clue -- as to when the different families split
up? When did Bantu split off? When did PIE and Uralic take
different paths? Etc, etc.

||| daniel

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