Have all the toppings ready in bowls/plates, all the dough ready, create a conveyor belt. Few mins creating each pizza, few mins cooking each pizza. Dont bother waiting for everyone to get a pizza else they will be cold, out the oven, someone to slice it up, help yourself. Dont let people make their own, takes ages faffing around. Just churn out a load of different pizzas. But yeah. will be creating and cooking for at least 40-50 minutes I would expect.