Well, I've had it take longer, several days, but I'm patient. Liquid CYA is fairly new, and, from what we've seen, seems to work and work quickly. I don't know what the Leslies product is, if it's the same stuff. But CYA's acidity has little if any effect on anyone's pH that I am aware of.
We are generally leery of new products like this, but we have heard that some people who used it were pleased with the results. Again, not Leslies, and VERY expensive.

If anyone else has thoughts on this.....

Carl