How Many Bets Until Loss Is Unlikely

A Kelly bettor on an even-money coin with $p=0.6$ stakes the optimal fraction $f^*=0.2$ each round. The per-round log-return is $+\ln 1.2$ with probability $0.6$ and $\ln 0.8$ with probability $0.4$, with mean $G\approx0.0201$ and variance $v\approx0.0395$. Using Chebyshev's inequality, find a number of rounds $n$ after which the probability of ending below the starting wealth is at most $5\%$.