You will be surprised to see that when you get your order faster than five minutes. There must be some complicated algorithm behind the question that takes into account how many people in line, number of registers and how long it takes. I do think five minutes is a bit of a wait for them, but I have been there when there were no other customers in front of me, got my food in just under two minutes, and still received that question. When it is really bad, you get the "Was there a bus in the parking lot?" question.
I once walked in just as the High School across the street let out for lunch. The place was run amok with kids. Realistically, this was probably worse than the bus scenario, but I had already done the drive-thru. I just explained what happened and it went through fine. Come to think of it, I just signed up to do lunch there again on Tuesday. Better check the school schedule ...
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Could I have a receipt please?