It probably takes a lot less time than frying up bacon and eggs. Remember that these are typically large extended families, and those are usually communal dishes. So there might be 12 foods in the middle of the table, but 6-12 people are helping themselves from the dishes. The other thing to remember is that most, if not all, of those foods are leftovers and/or prepared ahead of time in large quantities. It doesn't take long to pull stuff out of the fridge and put it on the table.