If you don't mind using a terminal, you can do it this way.

Execute : sleep 2h 45m 20s && systemctl suspend -i

It suspends your system in 2 hours, 45 minutes, 20 seconds.

I wrote a script for getting a GUI like this:

Copy the content of the script below and save it in your home directory as fast_suspend.sh .

#!/bin/bash # Tested on : Ubuntu 16.04 LTS # Date : 19-May-2016 # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. set -- `zenity --title="Scheduled-action" \ --forms \ --text='<span foreground="green">Enter Relative time</span>' \ --add-entry="hours" \ --add-entry="min" -\ --add-entry="sec" \ --separator=".0 " \ --add-combo=action --combo-values="poweroff|restart|suspend|logout"` hrs=$1 min=$2 sec=$3 action=$4 time=$hrs\h\ $min\m\ $sec\s #Checking validity of the input : re='^[0-9]*([.][0-9]+)?$' if ! [[ $hrs =~ $re ]] || ! [[ $min =~ $re ]] || ! [[ $sec =~ $re ]] then zenity --error \ --title="Invalid Input" \ --text="You have entered an Invalid time!



Only positive integers supported" exit 1 fi case $action in "poweroff") zenity --title=Confirm --question \ --text="Your system is about to <span foreground=\"red\">$action</span> in ${hrs%%.*} hours ${min%%.*} minutes ${sec%%.*} seconds.

Are you sure \?" if [ $? -eq 0 ] then sleep $time && poweroff else exit fi ;; "restart") zenity --title=Confirm --question \ --text="Your system is about to <span foreground=\"red\">$action</span> in ${hrs%%.*} hours ${min%%.*} minutes ${sec%%.*} seconds.

Are you sure \?" if [ $? -eq 0 ] then sleep $time && reboot else exit fi ;; "suspend") zenity --title=Confirm --question \ --text="Your system is about to <span foreground=\"red\">$action</span> in ${hrs%%.*} hours ${min%%.*} minutes ${sec%%.*} seconds.

Are you sure \?" if [ $? -eq 0 ] then sleep $time && systemctl suspend -i else exit fi ;; "logout") zenity --title=Confirm --question \ --text="Your system is about to <span foreground=\"red\">$action</span> in ${hrs%%.*} hours ${min%%.*} minutes ${sec%%.*} seconds.

Are you sure \?" if [ $? -eq 0 ] then sleep $time && gnome-session-quit --logout --no-prompt else exit fi ;; esac

Additionally you can create a .desktop file to run it.

Copy the text below and save it as fast_suspend.desktop .

[Desktop Entry] Type=Application Terminal=false Icon= Name=fast_suspend Exec=/home/your-user-name/fast_suspend.sh Name[en_US]=fast_suspend

Provide execution permission for both files - execute :

chmod a+x ~/fast_suspend.sh ~/Desktop/fast_suspend.desktop