What is the bottom of the hour?

The bottom of the hour refers to the exact 30 minute mark of an hour, such as 1:30 p.m. or 2:30 a.m. Generally, in broadcasting or scheduling, events or shows often start or end at the bottom of the hour, as it provides a clear and consistent reference point for viewers and listeners. Additionally, some people use the bottom of the hour as a reminder to take a break or switch tasks.