What's the oldest you've had a duck start to quack?? Hoping I have some late quakers. My crested magpie(8 weeks), khaki campbell(8 weeks) and one of my pekins(9 weeks) have been real quiet. Hoping ya'll can help me out based on the coloring with my khaki.... I know it can take up to 10 weeks or so to quack, but I feel like they should be quacking by now. I have 2 females the same age that started quacking weeks ago.