4 minutes ought to do it.
It's a flatworm so one treatment is usually enough to get them to literally fall off. In really bad cases maybe two treatments a day or two apart.
FWIW, and maybe this is bad of me, I don't know, but when I was advised what to do, I was told "don't bother matching pH, just use tap water, but DO match the temperature") and the tang was fine and I never had to do it again. (Which is probably good because I can usually catch a fish once, and ever after that they're onto me and I can't get near them with a net.) I'm not sure what you'd have to use if you wanted to match pH. If you could match pH I'm sure it would be easier on the fish.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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