How is 'Total Overrun' calculated in the Theatre Utilisation Session Details table?

To find the session details table, navigate to Surgery > Theatre Effectiveness > Utilisation and select the 'Session Details' button. 'Total Overrun ' is Column Z.

"Total Overrun" refers to the total minutes session overruns the allocated session minutes.

This is not included in total utilisation (Column Y) as it is above the allocated session minutes.