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This question has actually been covered (although not to the complete extent of evolutionary history) by Richard Dawkins in his book The Ancestor's Tale. He gives the following estimates of LUCA time and generations: Monkeys and apes: 40MY(3M) Mammals: 180MY(120M) Reptiles: 310MY(170M) Ray finned fish: 440MY(195M) Sharks, hagfish and lampreys: ...


If you're willing to accept many orders of magnitude and define life as the Last Universal Common Ancestor. For the rest of this answer, life begins 3.5 Gya with cyanobacterial mats and stromatolites and so on. Genetically the LUCA is dated to around this time, which matches the fossil record and everything's great. The LUCA can't have sprung from ...

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