Don't you see that lots of what you see is based on assumptions of which you have no clue at all that they are correct?
The best evolutionists can figure is that it took about a billion years for the initial single-celled organisms to evolve into multicellular organisms.
Which is just a guess, as you know. A guess based on not very much evidence at all.
The single-celled organisms were probably much like our bacteria today at first.
How do you know?
That means they had a generation time of about 20 minutes.
Does it? Does that mean anything?
The generation time for many animals is one year.
Now it is, yes. But do you know anything about millions of years ago?
I am sorry, but you have nothing solid to base those calculations on.