If your really worried about the timer, why not just leave the lights on 24/0??
Ive done it a lot of ways, 24/0, 18/6, 20/4, ect ect... doesnt really seem to matter much to my plants, in terms of growth.. In fact, they seemed to respond better to 12/12 if they were on 24/0 before flowering.. Just my opinion.. :hippy: