D600 D610 D800 standby modus

Anyone who knows if either the D600, 610 or 800 can be used with HDMI out without going to sleep/standby after 30 minutes?
 
I can confirm the D800, in Settings you can turn of the automatic timer for leaving live-view and I hade the camera running for about 2,5 hours with HDMI-out on.
 
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