Nikon Z8 User Manual page 659

c3: Power Off Delay
Choose how long the displays remain on, and how long the camera waits before returning from
picture review to shooting mode, when no operations are performed.
Longer power-off delays reduce battery endurance.
Option
[Playback]
[Menus]
[Picture review]
[Standby timer]
Choose how long the monitor or viewfinder waits to turn off after playback
starts.
Choose how long the monitor or viewfinder waits to turn off after menus are
displayed.
Choose how long the camera waits to return to the shooting display after
picture review starts when [On] or [On (monitor only)] is selected for [Picture
review] in the playback menu.
Choose how long the exposure displays in the control panel, monitor, and
viewfinder remain on after the shooting display is activated.
The monitor and viewfinder dim a few seconds before the standby timer
expires.
If [10 s] is selected, the timer will be extended to 20 seconds while the i
menu is displayed.
G button U A Custom Settings menu
Description
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c3: Power Off Delay