Steve, where did you get that data? The process of degradation is continuous, not something that happens all of a sudden. A good guideline is the half-life chart that is a function of concentration and temperature at the bottom of the Odyssey Manufacturing bulk product page. You can see that 6% bleach, which would be close to the 5% line in their table, lasts quite a long time, while 12.5% chlorinating liquid, which would be in between the 10% and 15% lines in their table, decomposes roughly 3-5 times faster. This tool is interesting, but unfortunately only shows 7 days of decomposition data.