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you are right! it holds for any $T>0$, then I can take $T \rightarrow \infty$ and cover all the same values as with $\log(5T+1)$? I believe that is what you mean to say
thank you for the details! how do i reconcile this with $v(x,t)$ being in $L^2([0,T];H^2(\mathbb{R}))$, since the interval is not always smaller than $[0,\log(5T+1)]$?