What: What have I done? is where co-workers record their time reports.
This might help if you are wondering:
You can report time in quarters and also leave comments to note what you have done. You will see an overview of your hours in the right corner. If you have worked overtime, you will have a negative number on the left to the report.
When you have reported on the whole month you can mark the month as done so that admin can see who is done with their reporting.
Weekly planning - If you choose this view you can easily add time for an activity for the whole week altogether (unlike the monthly view where you have to add a new row for every single day)

Suggestions from planning:
How to copy and paste:
See last weeks rows: