this is about an oil leak not how much time it would take to remove an engine.
although,
I did it in 4, with another guy who i had to give instructions on what to do, and tools in a bucket. I had to hacksaw shit off lol but thats on a 4x2, with front diff in the way removing engine would take longer. and the last bell housing bolt was in a bind so much it destroyed my biggest half inch drive.
If I really tried, and all things went smooth I say a solid 2-3 hours is reasonable.
2 hours if you got anything you need and you know exactly what to do with pneumatic. There is nothing to taking these out.
Its so simple. lol