[VadeRetro]

Then, considering microbial generations, we have to multiply 3.5 billion by 365 and multiply the resulting product by 24, no, let's say by 15, since the day was shorter billions of years ago.

If you aren't going to put more days in the year (the Earth's orbit around the Sun being about the same), you might as well leave it at 24-hour days.

[snarks_when_bored]

Correct. That's why I didn't bother posting again. There are about 8700 or so generations per year.