SGTimer integrates in the notification area (system tray), displays a floating widget return report (transparency is supported), jobs can be for up to one week, any of the jobs can be saved in "presets". Before performing the task, you can set the notification is displayed, the audio signal and/or command (e.g. shut down the application before shutting down).
Installation latest version into Linux Mint:
sudo add-apt-repository ppa:georgdh/gdh sudo apt-get update sudo apt-get install -y sgtimer
Remove from Linux Mint:
sudo apt-get remove --purge sgtimer
May the Force be with you,