Depends on the human. I think 10 levels with branching factor 10 and 1 day per step is in the ballpark of “go from no calculus to general relativity,” (at least if we strengthen the model by allowing pointers) but it’s hard to know and most people aren’t so optimistic.
Yeah, I don’t know how optimistic I should be, given that one day isn’t enough even to get fluent with calculus. Can you describe the thought process behind your guess? Maybe describe how you imagine the typical days of people inside the tree, depending on the level?