My muscovies don't lay for a couple of months after hatching, then come August/September there's moulting to be done and then the light goes. Mine aren't in lay now but I did find a nice stash of eggs late september.
Hens are the same, if they hatch early they'll come back into lay in about 7-8 weeks. If its say June/July, they probably won't as energy will then be taken up with the moult. Sitting on eggs for that amount of time, then raising ducklings/chicks is hard on their condition-takes a while to get it back.