Two years! The Quaker I got in November had her feathers cut off so drastically. The flight feathers and then half way up the wings. It looks terrible. She crashes to the floor. Poor baby. I asked the previous owner why she cut them and she said so the bird couldn't get out the door. It looks like they were cut in a fit of rage. They aren't growing at all. I was hoping for six months. Oh well!
Factors include good nutrition, humidity and temperature, but parrots, of necessity, don't molt out all their flight feathers at one time as do some other birds (sea birds often do). As the feathers are replaced, the bird will notice and when they reach 'critical number' the bird will be able to first glide, then fly limited amounts, then soar. Just keep them safe in regard to heights until the feathers start growing back. Good news is that spring is around the corner and the next molt is almost here.
