So I have discovered! Even the duck who sat, abandoned her clutch after 2 weeks. But we did get 4 healthy ones although with our luck, they'll all be drakes.
My first broody Call hatched 12 of 15 eggs. My second is currently on her 2nd clutch, due in a couple of weeks. She gave up on her first clutch after about 2 weeks, I finished some of them in the incubator (including my avatar, now 2 months old). My third broody's ducklings are due any day now! I checked them a night or two ago and they look very close.