The Time Sheet tab in a project/milestone displays the total time spent by project members on various tasks of a project/milestone. The Time Sheet tab also displays the cumulative time spent by all the project members on various tasks.

In the Time Sheet tab, click the respective member's name to view the time spent.

You can export the timesheet by clicking Export as PDF.

The milestone Time Sheet tab logs the time spent on tasks in the Milestone whereas the project Time Sheet tab logs the time spent on all the tasks in the Project.