Nikon Z9 Mirrorless Camera - Manual (Page 149)

149 Release Mode
High-Speed Frame Capture (C30/C120)
For high-speed burst
photography at frame rates of 30
or 120 fps, set the release mode
dial to
c and then hold the c
button and rotate the main
command dial to choose [
C30 ] or
[ C120 ].
• The maximum length for bursts taken in these modes is
approximately four seconds.