Set Grub Time-Out to "0"

How to you set the grub time-out to “0” on Netrunner Rolling, so the computer boots up fast when you first turn it on?

Menu > System > Grub Customizer > General Settings > Timeout __ Seconds
File > Save
File > Install to MBR …

Or you can as root edit /etc/default/grub yourself and then run update-grub:

kdesu kate /etc/default/grub sudo update-grub