In the original 1984 movie, a couple stumbles into a town where children have killed all the adults and are in charge. They do this in order to appease a supposed god to bring a bountiful harvest. It’s basically lord of the flies mixed with the wicker man.
The adult couple in the course of one day are able to dispatch the cult of somewhere between 30-50 children.
If instead of it being two random civilian adults, if John Rambo had come into the town, how quickly would he have defeated them? Keep in mind, these children (ages ranging from 8-18) have no formal combat training. But they do have home field advantage and they have the numbers (at least a couple dozen of them vs 1 man).
My prediction, instead of taking a full day, John Rambo defeats them in less than 2 hours.