As a user, I want to see the waiting time due to resource contention.
This is the waiting time when a case waits to be processed because the assigned resource is busy doing smth else (processing other cases). To identify this waiting time, check if the waiting time interval overlaps with any processing time where the resource is involved.
WTreource_cont = sum PT of the resource for other cases in the handoff interval
As a user, I want to see the waiting time due to resource contention.