What is your fastest time to pull an engine, install another and drive it away?

Back around 75 or 76, I swapped a 273 out of a 65 Barracuda and swapped another one back in....in about 4 hours. Did it in the street in front of a co-workers house. It was an automatic car, and I left the transmission in the car. I was 18 or 19 years old. He gave me $100 for the motor after hearing it run and another $100 to swap it in. I thought I was rich....lol.