I would be reluctant to put the hens on a "decreasing" light schedule. You may just move them to the opposite problem - zero eggs.
There are infections and other risks with high egg production. Constant laying can also deplete their bodies. However, they have more egg-producing potential than will ever be realized, even with a long life.
Most of the follicles in their ovaries, unlike with some animals, will never develop into ova. There are thousands and thousands.
The hen stops laying for reasons other than "running out" of eggs - or so the poultry scientists tell us.
We are blessed with an artificial selection for egg production that has been going on for many, many years. The wild chicken produces a fraction of what the domestic hen is capable of.
I think the best we can do for them is to try our darnest to give them good care and everything that their bodies require. They are doing their best for us.
Steve