LG Machines
Are technically supposed to introduce, Chlorine Bleach, sometime during the last 10 minutes of the wash cycle. But, one finds, if you're not careful, and use more than 1/2 cup, it dispenses in seconds.
Honestly, I've found it easier, to just run another cycle, with Bleach as needed, than trust the dispenser. You really want the Detergent to have a go at the dirty laundry, before the bleach does. I think the Dispenser, was just simply poorly designed.