Thanks for the link but this doesn't seem to be my case. Folks are already authenticated, what I'm trying to do is give them a bank of hours (say four) of connectivity to be used after midnight each night. If they use all four of those hours on Monday night, then Tuesday at midnight they will lose their connection as they do now based on the rules in the controller.
Also, the second step in these instructions doesn't line up with what I see. I have no option to choose Endpoint as the first drop-down, not can I choose "Guest Role ID" in the second line.
Thanks for the link though, it is good info.