How many labor hours are needed to replace an engine?

This may vary from shop to shop. I find that the published labor times are sometimes unrealistic and we look at each job like that individualy. 1 1/2 days in some cases and 2 1/2 days in others.

I have a 90 Nissan 300z and it took me 16 hrs to pull my old engine out of my car and put a better low mileage engine in...1-1/2 to 2-1/2 days is stretching it a bit don't you think