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As you are testing, the first drop that changes from the initial color to the other determines that kH, IME. This is also the case with regard to gH.
I would not wait for any other changes to take place.
P levels become a problem when they become out of balance with your content of K and N, causing an increase in algae. I don't think that there is a definitive number that you can look at because every tank is unique, and as such has different requirements for each element.

Len
 
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