from Chapter 2. Open the Process module, change the Delay Type to Expression , and enter the appropriate Expression (use the Expression Builder if you like). Run the model for 20 minutes and check against your hand-simulation results. If they’re different, what might be the explanation (assuming you did everything right)? Next, try running this for 48 hours and watch the queue-length plot (for both plots, change the Scale Maximum for the Time (X) Axis to 2880 and increase the MajorIncrement to 240 ). To allow more room in the queue animation, click on the line for the queue and drag its left end to the left. What’s happening? Why? Put Text boxes inside each of your Arena f les to contain the discussions requested.