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

Flat rate, Target hours, piece rate has benefits and drawbacks. It appeals to those that agree with Capitalism.
The harder that the employee works, the more money they can make. The slower, the lazier, the dumber one is. the less money they earn.
Yeah, back when I was a line mechanic, I worked flat rate and almost always could beat the time. As a shop owner, I also had my guys on flat rate because they could turn out more jobs and make me more money. You just had to keep on them to not cut corners. Otherwise, quality would probably go down, and eating comebacks didn't make anyone happy.