The purple bars represent the time saved for nursing staff and anesthesia if there is a policy for the surgeon to be ready to cut 30 minutes (adjustable) before the scheduled start of cases in the morning.  The effects of policy time alterations for an entire day’s scheduling can be simulated in less than a minute for future cases, and for past cases. Individual cases changes can be seen immediately.  If routine data is entered for each case, a retrospective cost to the OR of a surgeon’s showing up early or late is easily viewed. The financial effects (numbers) can be setup to calculate automatically depending on pay scales or opportunity costs at a specific hospital.