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It should be pretty immediate on contact with the bugs. You'll need to do a follow up treatment in a week or two since I don't think it affects eggs.

The mites that are on the birds - are they under the feathers on the skin or mostly on the outside? If on the outside of just a few chickens but otherwise swarming other areas of wood in particular, it could be mold/grain mites. I had a battle with those last year. When out of control, they can...