Sorry list, I know this has been addressed on list before, but my memory fails me. YFull suggest that after the SNP L617 occurred, the tree started branching out about 3,400 years ago. L617 may have occurred much earlier than this. I have access to 4 YElite results for L617s. One of these has 68 SNPs/ novel variants which Full Genomes feel confident enough about to name. There are many more lower reliability mutations discovered which for the moment I have put on the back burner. But my first observation is that if it is 68 reliable mutations in 3,400 years that would be a nice simple 50 years per mutation. I have not yet counted the total mutations in other branch lines, it is on my to do list. I believe some have looked closely at rates of mutations found in YElite, does the 50 years per "reliable" mutation sound consistent with what others have found? Of course, the speculated 3,400 years to common ancestor in my example is not firm and final, so it is a suspect figure to use for calibration of SNP rates. John. Sent from my iPad