The Impossibly Long... Blackboard

Legend has it that my school has a really long blackboard. A reaaaally long blackboard. (I know, that's a really mundane way to start off a question. Please don't judge me.)

On this board, I write out the decimal representation of all the integers from 1 to \(10^{100}\), and it takes \(0.01\) seconds to write each digit; the total time in seconds is \(T\).

I then choose two numbers at random \(a\) and \(b\) and replace both with a single number \(a+ab+b\). After some number of iterations, the single number left is of the form \((n+1)!-1\).


\[\lfloor T \rfloor \pmod{\log_{10}(n)}\]


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