What is the minimum recommended temperature for keeping food hot before service?

Raw hot food should be cooked at or above 80 degrees C for 8 mins (which kills all germs), after that, hot food should be served strait away, it does not matter what temp the food is after it has been served as long as it is eaten within 20 mins (and does not get below 45 C), then you need to reheat the food for 4 mins at or above 60 C or cool quickly to be stored in the fridge or freezer.