The Labor Breakdown is an important and powerful part of your Project Overview and can be found in the middle of the page, between Margins and System Breakdown.
Selecting the "Crew of" drop down allows you to control the division of labor based on crew size.
Selecting the "X Hour Days" drop down allows you to control how long your crew's workday is.
Changing these fields will affect the total number of work days for each labor category.
Let us know if you have any questions!