Nikon D7000 - Manual (Page 94)

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4
Open the shutter.
Bulb : After focusing, press the shutter-release button on the camera or optional
MC-DC2 remote cord all the way down. Keep the shutter-release button
pressed until the exposure is complete.
Time : Press the ML-L3 shutter-release button all the way down to start shooting.
5
Close the shutter.
Bulb : Take your finger off the shutter-release button.
Time : Press the ML-L3 shutter-release button all the way down. Shooting ends
automatically after thirty minutes.