Default timeout set for booting GRUB in Debian Linux is 5 seconds. This is really long for (mobile) Desktop Linux users like me who frequently start and stop computer while moving from location to location. Thus I found it useful to decrease the boot timeout set in GRUB in order to decrease my overall boot waiting time.
hipo@noah:~/Desktop$ grep -i timeout /boot/grub/grub.cfg
To decrease GRUB boot timeout I had to change timeout=5 to timeout=1.
That’s all enjoy 🙂