Before revision: Note that the residence time of a specific compound in a mixture equals the turnover time (that of the compound, as well as that of the mixture) only if the compound doesn't take part in any chemical reaction (otherwise its flow isn't conservative) and its concentration is uniform.
After revision: The residence time of a specific compound in a mixture equals the turnover time (that of the compound, as well as that of the mixture) only if the compound does not take part in any chemical reaction (otherwise its flow is not conservative) and its concentration is uniform.