two technicians should easily cover all repairs and PPM's.
Absolutely, two should be quite sufficient unless it was a highly specialised hospital (cardiac for example). If it is a general med/surg, two would be comfortable I would have thought.
......and, if I ever found one of my staff taking 2 hours to PM a defib they would be looking at, at least, a serious telling off for being very
slow or if they persisted, a new employer.