So, we have $N \geq 10^{15}$.
Now, we can plug this into the formula and solve for $L$:
$L = \log_{256}(10^{15})$
To solve for $L$, we can use the change of base formula:
$L = \frac{\log_{10}(10^{15})}{\log_{10}(256)}$
We know that $\log_{10}(10^{15}) = 15$
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