Q:

Defining terms: man hours vs. calendar hours

I find myself regularly expressing project schedules using two terms. I have made up one of them and it is clear to my listeners what I mean. However, I suspect that more common terms exist for these items.
The terms are:

Working hours - This is a statement of actual or estimated working hours. For example a "40 hour" project. I think the common term for this is "man hours"
Calendar time - This is how long a project takes in terms of dates. As in, "I'll have it by next Tuesday". I do not know the term for this.

These terms are applied in the context of, "This is a 20 hour task and based on my schedule it will be completed in one week.". This shows the effort involved as well as the scheduling aspect.
What are the correct or widely used terms for these concepts?
To clarify - I am NOT asking about the conversion and application of man-hours vs. calendar-time. I simply want to make sure I am using the right nouns for those two concepts.

A:

Man hours are correct for your working hours however be careful that these are multiplied by the number of people working.  For example a team of 5 working for an 8 hour day on a project contributes 40 man hours.
Duration or wrap up date can be used to discuss your calendar time depending on context.
Taking your example "This is a 20 man hour task and based on my schedule it will have a one week duration" sounds quite natural to me but "This is a 20 man hour task and based on my schedule our wrap up date is projected to be June 28th" would also be fine.

