No way it takes three minutes total. It takes about that much time just to pump 15gal of gas in an average flow pump. You also need to park, walk into the store, talk to the person, walk out of the store, etc.
Five minutes would be really fast.
You should actually time it. I pay at the pump with tap to pay which doesn't even require me to enter my zip or a pin, and I'm still almost 10 minutes overall for a stop to get gas. And I didn't even walk into the shop!
You'll need to add a bit of time to include pulling out of traffic as well, as chances are in the EV you wouldn't have even needed to make the stop in the first place.
Ok, fine, I exagerrated a bit, but actually I'm gonna time myself next time, I'm curious, thanks for the tip. And also yeah, with EVs there is no need to stop at all if you charge at home, that matters.