What is the weekly capacity of the operating rooms? i.e., how many surgeries can be performed in the operating rooms in a week on an average, assuming other resources such as surgeons, anesthesiologists, medical equipment, etc. are not limiting resources? How much would the capacity increase if the Hospital could decrease the operating room turnaround time to 15 minutes instead of the current 30 minutes? What would be the annual revenue impact of this shorter turnaround time if an average surgery brings in $2000 in revenue for the hospital? Should the hospital set a target of a 15 minute turnaround time for operating rooms