It really depends on the cause and the chicken. Sometimes it is a result of injury or Mareks disease. It can be hereditary in some chicks. Sometimes it takes days or weeks, but some never get completely better. You may want to increase the vitamin E to 400 IU daily, and little selenium in a small amount of cooked egg, tuna, or sunflower seed daily. Just a little is necessary.How long does it typically take for vitamin e deficiency to resolve once proper feed and supplements are provided?
I, too, have a 9 week old pullet with it (long story). Just gave Rooster Booster orally and dosed the water, wondering if this always lingers so long?