Variance of the time for a drifting walk to reach 7

A random walk on the integers starts at $0$; each step goes up by $1$ with probability $p=\tfrac23$ and down by $1$ with probability $\tfrac13$. Let $T$ be the number of steps until the walk first reaches $7$. What is $\operatorname{Var}(T)$? Answer $-1$ if it is infinite.

$168$. $T$ is a sum of $7$ independent, identically distributed passage times, each from one level to the next. A single passage has variance $\tfrac{4p(1-p)}{(2p-1)^3}=24$ when $p=\tfrac23$, so $\operatorname{Var}(T)=7\cdot24=168$.