While PlayIt Live's clock scheduler only works with full-hour increments, you can still schedule shows that start or end at 30-minute intervals. Create a single clock containing both half-hour segments separated by Fixed Time Markers. Go to Manage > Clocks, add a Fixed Time Marker at xx:00:00, add content for your first 30-minute segment, add another Fixed Time Marker at xx:30:00, then add content for your second 30-minute segment. Schedule this clock for your desired hours using Manage > Clock Schedule. The Fixed Time Markers ensure each segment begins precisely at the time specified, allowing you to effectively run different programmes within the same scheduled hour.