Nikon Zfc Mirrorless Camera with 28mm Lens - Manual (Page 135)

The mode selector
135
Shutter
speed
Description
Time
The exposure starts when the shutter-release button is
pressed and ends when the button is pressed a second time.
1
Keep the camera steady, for example by using a tripod.
2
Rotate the mode selector to M.
3
Rotate the shutter-speed dial and set the shutter speed to Bulb
(“Bulb”) or Time (“Time”).
Bulb Time
･ If the shutter-speed dial is set to [1/3STEP], use the main
command dial to set it to Bulb or Time.