Yes, we all did. Some people just like to nit-pick over the smallest of things to find a hole in an argument.
That said, while your numbers may add up, they do make certain assumptions.
That said, those assumptions, if they were false, should only push the time back by a couple months, another 4 at most*. So they still make sense. Thank you for the math steelrat, you've always been a genius with numbers.
*that estimate was in fact a S.W.A.G - Stupid wild $@! guess, I don't have time to do the full numbers due to RL, but I assume someone has. I just went with some intuition