You can probably get them to lay longer without lighting in the winter. This simply means you will get less eggs per year for a longer # of years, perhaps. Even if you add light, you will get less egss per year in each successive year. If you are merely keeping chickens a s pets, this will be fine for you. I prefer not to feed chickens that don't lay eggs so I use light & get the maximum # per year that they are bred to produce. Even with adding light I once had a barred rock that lived over 8 years & laid about 3 eggs/week until the end. Feed is too expensive for me to not have hens laying year round. It's up to you how you want to raise your hens. I don't think longevity is built in to most hatchery hens.