Keep in mind that a hen is born with all the eggs she'll ever have - they are unable to make new ones as they go. Sexlinks are "laying machines" for the first year or two of their lives and then burn out, and supplemental lighting can trick them into laying for periods of the year when they might otherwise NOT lay. But at the end of the day, once they've laid all their eggs, that's it. This is why people say heritage breeds can lay for longer than a sexlink - they may only lay 4-5 eggs a week, which means they can continue on laying for an additional year or two after the sexlink has used up all of her eggs.
This is a long way of saying that in your climate, your hens may not take a break from laying due to days getting shorter, but over their lifespan they won't lay more eggs than in any other climate.
This is a long way of saying that in your climate, your hens may not take a break from laying due to days getting shorter, but over their lifespan they won't lay more eggs than in any other climate.