If you want to be able to log the amount of time you spend working on issues, you need to first do the following:
- Click 'Administration' in the top navigation bar.
- Click 'Time Tracking' (under 'Global Settings') in the left navigation column.
- In the 'Hours Per Day' field, enter the number of hours in your organisation's working day (e.g. 8).
- In the 'Days Per Week' field, enter the number of days in your organisation's working week (e.g. 5).
- Leave the 'Time Format' as 'pretty'.
- Change the 'Default Unit' to 'hour'.
- Click the 'Activate' button.
For more about configuring time-tracking, please see the documentation.