This might just be a simple matter of documentation failure. As far as I can tell, the default timeout in EZTYP is 300 seconds. The theory behind that was that when a series of reports are spooled unattended, it would be unduly annoying if you came back the next day to find that it was still waiting for you to hit ESC from the previewing of the first one. To completely disable the timeout, you have to create a configuration file and plug in WAIT=0.
(Ty: please update the Setup Guide accordingly.)