While each user has a customized lesson, an overall ‘class’ occurs for 45 minutes. On the hour, aka :00, class will commence and will not end until :45 of the hour. Class chat is active the entire time that class is occurring even if a user finishes their class section ahead of time.
This means that an active user can claim a seat. As of v1.0, you may not be late to a class, and can only claim a seat if you arrive on time. Seating is green until a seat is selected, and then the particles are reduced and the color changed to orange.
When a class is closed you can no longer select seating.
This means that a class is ended. This only happens after :45 on the clock.