11. How long are cooked eggs held in hot boxes after they are prepared?

McDonald's Australia says eggs are held in a warming bin for no more than 20 minutes after cooking.
"Like many restaurants, we prepare certain items beforehand, in order to serve our customers in a timely way," the company writes. "Our food is held at a food-safe holding temperature, in the case of eggs, 79°C, until needed for an order. However, we've become really good at anticipating peak times, and cook enough to meet demand. Your McMuffin is assembled only when you order it."