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Depends whether they are fast or slow molters. But it generally takes 2-4 months. You can guesstimate how far into molt they are by checking the primary feathers. Feathers are lost one feather tract at a time (head feather tract, wings, femoral feather tract, etc). I don't remember what week they start losing the wing feathers (I think it's a few weeks in), but when they do start the wing tract they lose one primary a week, starting with the innermost and ending with the outermost. Also, the first tract to go is usually the head or neck, and the last is the tail (mine never seem to follow this though, lol). It's not spot on but it helps you figure out how long they've got to go.