When do eggs stop getting bigger?

[Chocobo]

So I some Buff Orpingtons and an Easter Egger and one of the BOs just started laying.
I know that the size of the eggs will slowly increase although the current size isn't nearly as small as I was expecting.
How long until the eggs are the size they'll always be?
Does winter affect the size of the eggs or just the frequency of the laying?

 

[Impress]

My hens lay mediums in the Spring and Summer, and then the eggs I do get in Fall and Winter are Jumbo eggs. It is like they take more time on them and make them bigger. But your mileage may vary.

 

[poseygrace]

Mine have laid pretty consistently sized eggs, I never noticed a big increase in size from when they first started to lay.

 

[CheerioLounge]

Aside from the occasional double yolker, the size of my girl's eggs has been very consistent. The only variant has been the color of their eggs; from pinkish to the standard brown.