This kupfer plugin is a simple way to quickly log time on different tasks to a textfile in your home folder.
Place Logtime.py in your kupfer plugins directory. In Ubuntu this is ~/.local/share/kupfer/plugins/
Open Kupfer Preferences, select hte plugins tab and then find "Logtime" in the list and enable it with the checkbox.
Developed by Ashton McAllan at BrightCookie.