How to stop SB-800 going into standby when used as a remote?

Does anyone know how to stop the SB-800 going into standby mode when it's being used as a remote flash??? I'm using the SB-800 on a lighting stand - triggered by the commander unit from the R1C1 kit.
There seem to be options to increase the standby time-out to 300 seconds, but none to switch it off altogether...
There seem to be options to increase the standby time-out to 300 seconds, but none to switch it off altogether...