Response to XTOL keeps how long after mixing?

I mixed 5 liters of Xtol in early May. I stored the bulk of it in a large glass bottle. I used some in early August, which allowed some air into the bottle and I didnt (lazy I guess) do anything about. I did make a mental note "must transfer xtol to smaller bottles soon" but of course I ignored it. Tonight I developed a mess of film in it (after testing with a scrap) and it was fine. So I guess it lasts at least 5 months

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