The time module lets you track the time you and your co-workers have spent an a certain task. Based on the hourly rates defined in the administration panel you can create reports that show the costs by user and/or workspace within a certain time frame. This makes it easy to bill a customer.
To generate a report click the “Print report” button in the upper right corner of the “General timeslots” table. This takes you to the time report filter:
The resulting time report calculates the cost based on the hourly rates which have been defined in the administration panel: