How long does a lesson go on for in the US?

There's no single answer to how long a lesson lasts in the US. It varies greatly depending on:

* Educational level: Elementary school lessons are typically shorter than high school or college classes.

* Subject: A lab science class might be longer than a humanities lecture.

* School/District policies: Different schools and districts may have slightly different schedules.

* College vs. K-12: College classes can range from 50 minutes to 3 hours, while K-12 classes are generally shorter.

While a common length for a high school class is 45-50 minutes, elementary school classes might be 30-45 minutes, and college lectures can be anywhere from 50 minutes to several hours, sometimes broken into smaller segments.