Where to change 30 seconds for grub on forced reset

I found it on my own

in file /etc/grub.d/00_header

on line 333 there is a costant

set timeout=${GRUB_RECORDFAIL_TIMEOUT:-30}

and you can override it in /etc/default/grub file like this

GRUB_RECORDFAIL_TIMEOUT=0

and now even if i force reboot/power off it will skip the grub