Cindy, your longest day is just over 15 hours according to a navy chart I found. Depending on when in August you start the lights they may well have already lost anywhere from 45 minutes to almost two hours of daylight. I remember from another post you said you provide 14 hours of light so that is a loss of one hour of daylight no matter when you start in August. If you were closer to the equator 14 hours might be enough.
The length of daylight isn’t the key, it’s whether the days are getting longer or shorter. That one hour loss of daylight is probably enough to start them molting. If you tried adding 15 hours of light in June at the summer solstice instead of 14 in August you might see different results if you want to. Maybe not.
Maybe this will help you understand why different people see different results. There are several things I’ve read on here that totally mystify me as to how people get the results they do. It’s just not in my realm of experience. Sometimes I can finally understand how something might happen but sometimes I just have to accept it. One example is when people post about baby chicks falling out of a nest with a broody. Then when I had a broody hatch in a very small nest I understood one possible explanation. The early baby chicks like to climb on Mama’s back while she is hatching the late chicks. If Mama is sitting too close to the edge of the nest, when the chick falls off it misses the nest. If I hadn’t experienced that I’d probably still be mystified.
I also want them to molt each fall to recharge their system so I don’t try to extend the days and keep them laying. But since all mine are or have molted I’ll add lights today to try to get them started. I’ll want hatching eggs in another month or so thus the need for them to crank back up. I’ll look at that navy chart and add about ten minutes in the morning every couple of days until I’ve extended the day by about 30 minutes, then using that chart see how long the day is considering subset. I’ll stop the supplemental lights when the natural day length matches my longest artificial day length.
Joemallo, some hens will start laying as soon as the molt is over but a lot wait until the days get longer in the spring to start. They can be pretty inconsistent about that, depending in the individual. If you add lights it can take a month or so for the hen to go through the internal changes to her egg making factory to start laying so be patient. If she has already started those internal changes you might see results a lot sooner.