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It's hard to tell. Just push the petroleum jelly up under the scales once a week for 3 weeks or so. That should suffocate any live or freshly hatched SLM. Then you'll have to wait. SLM is not really a dire issue.

Same here

I'd leave them together. Did the birds have mites other than on the legs?

Maybe longer, depending on how bad the mites infestation is. Pics of the birds legs would help here @CHICKENX2005