Linux Mint

# Display current timeout
gsettings get org.cinnamon.muffin check-alive-timeout

# Change timeout from default of 5 seconds (5000 milliseconds) to 60 seconds (60000 milliseconds)
gsettings set org.cinnamon.muffin check-alive-timeout 60000

# Set to 0 to disable completely
gsettings set org.cinnamon.muffin check-alive-timeout 0

sudo apt update && sudo apt upgrade -y && sudo apt full-upgrade -y && sudo apt autoremove -y && sudo reboot
sudo apt install mintupgrade -y && sudo touch /etc/timeshift.json && sudo mintupgrade

sudo cp /boot/grub/grub.cfg grub.cfg.bak
sudo sed -i 's/timeout=30/timeout=3/g' /boot/grub/grub.cfg 
sudo cat /boot/grub/grub.cfg | grep timeout
sudo update-grub