Anaerobic biotransformation of chlorinated organics, such as TCE (previously used as a dry cleaning solvent and refrigerant), occurs via a process called co-metabolism. This process can be modeled using a second-order rate expression, yet it is typically assumed that the concentration of bacteria remains constant. If the rate coefficient is 0.002 L/mg-d and the concentration of bacteria is 150 mg/L, how many days will it take for an initial concentration of 1 mg/L TCE to be reduced to 0.01 mg/L (10 g/L, which represents a 99% reduction)?