Story about a Chik-Fil-A in Raleigh. Not long after everything reopened (covid) one in Raleigh that I lived near started full-time having multiple girls in the drive through line, some to take orders, then a few cars ahead of that to take payment, then a few cars ahead of that to tell you "merge in behind the black car beside you". And they got really efficient. So much so that after about a month they advertised for a couple of weeks that they were going to try and set a record for most cars going thru the drive-thru in an hour. They wanted to get 500 cars thru in 1 hour. Yes, 1 every 7.2 seconds.
They even sent out emails to those who use their app, they were putting free chicken sandwiches on your app if you did the mobile drive thru that day. I upgraded mine to add cheese & remove the pickles.
The day came, I went, and the double-line was out to the street, nearly football field length, with even more girls out working. It only took me 3-4 minutes to get to the window, I did not even come to a full stop, I literally drove thru at 2-3mpg as they were handing me my food.
They sent out a follow-up email a few days later saying that they did achieve their 500 car goal in under an hour.
Meanwhile during that same time period, the next closest CFA couldn't probably do 50 cars in an hour. I wouldn't even go there they were so slow (I lived about 1/2 between the 2).