You can generate such a report in our People Explorer Reporting Tool, which will provide insights into the total number of scheduled working hours and the associated costs for hiring new employees.
Go to Reports > Explorer
In the Type column, choose Placeholders only
Turn on the Detailed Toggle in the top left corner, so you can see the projects associated with the placeholders
Click the Fields button and tick Skills
Select a date range
Click the Metrics button on the right and tick Total Hours and Project Costs