That doesn't answer the question. Even if you're still tweaking things today, what do you expect the useful lifetime of a batch of your enzymes to be, say, a year from now?
more than a month. Best to think of it in terms of H2O2 turnovers per enzyme. Imagine if we made a new enzyme that had 10x faster turnovers but a 5x lower lifetime. Assuming we could still keep up with its oxygen demands, that is a better enzyme despite a lower lifetime.