link: https://askubuntu.com/questions/711062/how-to-modify-waiting-time-of-the-dual-boot-menu
Open a terminal window, then back up the existing grub config file:
sudo cp /etc/default/grub /etc/default/grub-backup
Now (using sudo or gksudo depending on your editor of choice) edit /etc/default/grub and change the number in this line of the file
GRUB_TIMEOUT=10
to your desired waiting time in seconds.
Exit, saving the file, and then run
sudo update-grub
On your next boot you should have the wait time you specified.
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