In Production Scheduling, how do we model the time delay between operations?

In a test instance, I have added a set of items to be considered in a Production Schedule.  I notice that operations immediately move from op 100 to 200 to 300 and so on.  After the solve, when I look at the start times of these operations...assuming there are no constraints on the resources specified in the routing, the start time of operation 200 will be one second after the completion of operation 100.

What is the best way to account for a typical delay to move materials from one operation to the next?  Our routings do not attempt to model the Material handling activities.  So it is possible that completed products could sit on a cart for a period of time waiting for material handling to move the materials to the next resource.