Is it okay to add eggs?

[HollyDuckFarmer]

Hello there. I just wanted to ask, how long can I add eggs to my broody Pekin Duck's nest? She started sitting 3 days ago, made her own nest! Yesterday I counted 12 eggs. Today another of my ducks left me an egg, so I slipped it next to my broody duck. I watched her and she seemed to accept the new egg into her nest. So, how much longer will I able to do this? Thanks as always!

 

[Sweetlilbaby]

I wouldn't add anymore now. day 3 is the latest I'd add them because she'll have to set on the new eggs longer.
If you do not want to eat the eggs you could collect and sell the duck eggs for someone else to hatch or in an incubator to slip in with her babies after hatched.