I looked back at my Girl that had it really bad, I got her a couple weeks ago, and there dead with a couple hours, I did this on Sunday, and i rechecked her today, i didn't see any.
i will redo her again in a week and the next just make of the eggs get killed to.
my girls are only 15 weeks...
I pretty sure its every 7 days until it clears up.
as it goes for 7 I'm not sure, I used one that is safe for all animals, and it said not to put in the nest box. where they lay their eggs.