reports by court hour used

We need to be able to track court hours used by reservation type.  (ie how many hours are being used for USTA matches, how many are used by High School Team Practices, and how many are used by the general public)  Currently, in order to get that information I have to download reservations by type and manually calculate the hours used because the date/time are together so I cant use a formula and the is not a number of courts used column just court name.