GetOverview makes it really easy to track time. There are multiple ways to log your hours:
You can use project detail page and see your and everyone's aggregate hours. To see hours in more details, you can open timesheet and filter based on time range, project and user. You can also export CSV of specific project or 30 days of data for all projects.
You can also filter timesheets based on project groups. For example if a there are 5 projects under a group. You can see timesheets for all 5 projects by selecting the parent group.