Its got to due with the fact that, like a woman, a hen is born with all the eggs they will ever lay. On top of this they only lay eggs from one ovary as the other (left one I think) doesn't develop all the way. So the faster they lay the eggs the faster the hen gets done with her egg laying days.
Patience is not one of my stronger virtues unfortunately. Guess I'll just keep giving them good feed and lots of roaming in the run and see how it goes.
