Use the command in terminal bash or zsh where the -h parameter will take a number which is in minutes.
sudo shutdown -h +30To shut down your Mac immediately:
sudo shutdown -h now-r for restart -h for shutdown -s for sleep
Use the command in powershell or windows terminal where the -t parameter will take a number which is in seconds so 10 minutes is 600 seconds. So with (1200) is 20 minutes.
shutdown –s –t 3600Windows 10 Terminal
shutdown /s /t 3600