White Layers are wonderful ducks! - At least mine are.
They are as goofy as Peking Ducks but without the permanent worry about leg and hip problems. My White Layers started to lay at the beginning of their fourth month, around 13 weeks and they have been laying continuously since then.
I have no clue what kind of breeds went into the White Layer, but there must be some Pekin in the genes, considering their ravenous appetite. A cross between White Layer and Buff Orpington resulted in a brown/black colored drake, the pattern is almost wild, but there is no green in that guy. And he is very relaxed.
I stopped feeding them duckling food when they were two months old and went outside with the grown-ups, where they gorged on tasty pellets and started to drill for worms, larvae and roots.