Thermal Processing and Kinetics

Vitamin C degradation in orange juice follows first-order reaction kinetics $\ln(C / C_0) = -k t$. If the rate constant is $k = 0.0231\text{ day}^{-1}$, the half-life $t_{1/2} = \frac{\ln(2)}{k}$ in days is: (Take $\ln(2) = 0.693$)