Not sure why mine lasts so long. I guess it depends what you want, but I usually dump mine before it looks bad to me. AND I microwave the chemicals in brown glass bottles to get them up to temp. I have been warned against this but no problems in 2 years. I do 35, 120, and 220.
Where do you find 220?
Also, that's craziness... You must live in an alternate dimension...
The Noteworthy Ones - Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1 / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic
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~Stone | "...of course, that's just my opinion. I could be wrong."~Dennis Miller