Nikon D300 - Manual (Page 306)

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c3: Self-Timer Delay
c4: Monitor off Delay
This option controls the length of the shutter
release delay in self-timer mode. Choose from
2 s, 5 s, 10 s, and 20 s.
Option
a 2 s
b 5 s
c 10 s (default)
d 20 s
This option controls how long the monitor
remains on when no operations are
performed. Choose from 10 s, 20 s, 1 minute, 5
minutes, or 10 minutes. Choose a shorter
monitor-off delay for longer battery life.
Regardless of the setting chosen, the monitor
remains on if no operations are performed for
about ten minutes when the camera is
powered by an optional EH-5a or EH-5 AC
adapter.
Option
e 10 s
f 20 s (default)
g
1 min.
h 5 min.
i 10 min.