Nikon D3300 - Manual (Page 267)

247 B The Setup Menu: Camera Setup
Choose how long the camera will wait for
a signal from the optional ML-L3 remote
control before cancelling remote release
mode. Choose shorter times for longer
battery life. This setting applies only
during viewfinder photography.
Choose the pitch (High or Low) of the beep that sounds when
the camera focuses and in self-timer and remote-control modes.
Select Off to prevent the beep from sounding.
The current setting is shown in the
information display:
3 is displayed when
the beep is on, 2 when it is off.
Remote on Duration (ML-L3)
G button
➜ B setup menu
Beep
G button
➜ B setup menu