How many labor hours are needed to replace an engine? on 1990 Nissan 300ZX

The new engine has 25,000 miles on it.

Asked by for the 1990 Nissan 300ZX
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.
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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