Nikon D780 - D6: Extended Shutter Speeds (M)

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Menu Guide >
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Custom Settings
Extend the range of shutter speeds available in mode M; the
slowest shutter speed available when [On] is selected is 900 s
(15 minutes). Extended shutter speeds can be used for pictures
of the night sky and in other situations that require that the
shutter remain open for long periods.
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To use extended shutter speeds, choose [On] and select a
shutter speed of 60 s or slower.
d6: Extended Shutter Speeds (M)
G
button
U A
Custom Settings menu