If you're wanting to transfer timesheet hours to your payroll system, it helps to view the hours logged in a decimal format. For example, you might want 1 hours and 30 min presented as "1.5" instead of "1:30."
To get submitted timesheet hours into a decimal format, the simplest approach is to export the timesheet hours to CSV.
When you open the CSV file, the hours will be presented in decimal format.
The "export" link can be found in the upper right hand corner of the "All" tab of the Timesheets screen.