This allows you to change the durations of different states. I mean, for example, if it is easy to make an ogre fall asleep, but he doesn't sleep for long, then you can cast a spell making him vulnerable to sleeping long before casting your sleep spell on him.
Here is the link to the page for the free download of this plugin: https://a-higher-plane.itch.io/change-state-duration-plugin-for-rpg-maker-mv