The classes round the clock are not available. You may schedule a class for max 120/180 minutes depending upon the type of account you hold on WizIQ and then may extend it in the Virtual Classroom. Free members can have a class up to 120 minutes where as premium members up to 300 minutes.  You should extend it cautiously else the recording of the session is not available to you or the attendees. We are soon coming up with the feature whereby you can have your online classroom open all time or choose the time when it's accessible to others.