I think what you are referring to is actually a cycle shorter than 24 hours. If you go to the forums sponsored by Advanced Nutrients, there is a long thread with a guy detailing his grow on a shorter cycle. Basically he got a digital camera, and 15 days into flowering he switched the light cycle to 6:40 on, 12 off. That way every week he picked up about 2 days. He said he didn't notice a difference in yield/quality, and they finished sooner. Swing by their website, he posted a lot of pictures to verify the results he was having.