Situation - Patients come to a lab to have a blood sample drawn. Modeling the delay (interaction) with the patient seems to be straight forward enough, but how do you model the delay after the patient has left and the server has to process the lab sample (log sample and transport) after the patient has departed and is not available to see other patients until these tasks are completed? I guess you might call this recover time after the patient has departed. In this particular case there are multiple servers (Phlebotomist) but would like to know how to handle for one server or multiple servers. Thanks.