The maximum duration of a show that is recorded live is 5 hours.  Although, to be safe, a host should plan to go no longer than 4 hours for a single episode, as sometimes the system will close out the show abruptly sometime between the fourth and fifth hours.

If the host desires a longer period of time than 4 to 5 hours, the host can announce to the room that the call is about to end but that a second call will be starting shortly. Then the host can "End" and "Terminate" the call and then immediately start a second call by scheduling it for "Right Now".  Anyone on the first call will have to log back into the second call's text chat and/or call back in on audio into the second call.