Nikon D90 - Manual (Page 106)

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4
Open the shutter.
A: After focusing, press the shutter-release button on the camera or
remote cord all the way down. Keep the shutter-release button pressed until
the exposure is complete.
&: Press the shutter-release button on the remote control all the way down.
The shutter will open immediately (quick-response remote) or two seconds
after the shutter-release button is pressed (delayed remote) and remain open
until the button is pressed a second time.
5
Close the shutter.
A: Take your finger off the shutter-release button.
&: Press the shutter-release button on the remote control all the way down.
Shooting ends automatically after thirty minutes.
Length of exposure: 35 s
Aperture: f/25