In the main left-hand menu under Reports - Time Reports you find a detailed report over all the time reported in the system.

The report offers you a variety of selections allowing you to look at your reported time in many different ways. For example time per User,  Assignment, Period, un-invoiced, approved etc...
Test an see what suits your needs.

The report can also be exported to Excel, with all information organised into columns if you need to import time to a payroll system for example.