16: Self-Timer; 17: Remote On Duration - Nikon D40 Owner's Manual

16: Self-Timer

Choose the length of the shutter-release delay in self-timer mode
( 33). The default setting is 10s.

17: Remote on Duration

Choose how long the camera will wait for a signal from the
remote before cancelling delayed or quick-response remote
modes ( 33). Choose shorter times for longer battery life. The
default setting is one minute.
Menu Guide/Custom Settings 79