I would check with the manager to see why it is required that you be able to be there within 30 minutes. Where I work, a large academic trauma hospital, PACU nurses can be called in anytime the OR gets busy. The PACU is staffed 24/7 but if the OR gets busy we will have to call staff in. There are different factors that affect the volume of the PACU. The OR is not always able to know exactly when their cases will come out and we don't always know how long it will take patients to recover therefore if we have a few patients that are taking a while to recover sitting in the PACU and we unexpectedly have mutiple cases all closing at the same time we might have to call someone in and need them to be there quickly. I hope that helps.