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

One hour, not me, but a guy an acquaintance hired to pull and replace the V8 in a 70's impala. I saw him start as I was walking up to my girlfriend's apartment and he told me about it. I thought yeah right, ya'll full of ****. An hour later I walked back out and saw the old engine laying on the ground in a tire and the car with replaced engine running. I was stunned to say the least. To this day I wonder how he did it, then again the dude was ripping around with his feet barely touching the ground.
In the 80's I worked at JDC Autobody / Grays Towing in Reading Mass. My friend that I worked withs friend Tom Connery went out back and got a 350 ready to pull out of a wreaked Impala in an hour. He came in and said I'm ready. My friend told him to let us know when he was ready to pull the motor because I wouldn't believe it. This guy literally pulled the motor with no help or hoist. He reached over the motor from the side, grabbed the exhaust manifold and rolled the motor up to the apron, got another grip and rolled it up over the apron and top of the fender, then blocked it with a piece of wood so he could back his tailgate to the fender and rolled it in the truck. No bullshit. My friend was right! I never would of believed it without witnessing it.