The second way to get a Duck Feather is by purchasing it from the Traveling Cart for 750 – 1250g. If you feed it every day, in 5 game days you’ll have a grown duck that can produce Duck Feathers. The process takes 9000 in-game minutes to finish up. Alternatively, if you find a duck egg, you can place it into an incubator to hatch your very own duck. You can buy ducks from Marnie’s Ranch for 1200g. The first way, obviously, is to get a duck. There are three main ways to obtain the Stardew Duck Feather.