The first time my white duck sat on eggs she insisted on sitting on a nest of 29 eggs!!! She kicked out like 4 and I just kept putting them back in until eventually I decided to candle and the 4 were rotten. She ended up only hatching 8 because there were just too many for her to sit on and she was a first time mom..... Now all my ducks do that by kicking out the rotten eggs.
29 THAT"S A LOT OF EGGS, one of my hens tried to sit on 43 eggs, YEH, things did not go well in that hatching. CRAZY chicken