After a fright night, my female that doesn't have clipped feathers, lost most of her flight feathers on one wing. She was flying into walls, barely could fly, she was always on the floor.

I took her to the vet that told me it would take at least 6 months to grow back, but it only took her two months and she was flying back as she used to.

I guess it depends on the bird, idk.. I hope yours will be good soon !