So I rescued a duck from some people I know that didn't even have any water to swim in. Never having had a problem with mites I didn't even think about it but she had mites and past it onto some of my other ducks. I got some stuff from the vet to get rid of it and treated all of my ducks but I'm not sure it worked. How long does it take for the feathers to grow back on the top of there wings? Some of my ducks show no signs but others do and I'm not sure if there still infected or just haven't had feathers grow back yet.